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"An ER model is an abstract way of describing a database. In the case of a relational database, which stores data in tables, some of the data in these tables point to data in other tables - for instance, your entry in the database could point to several entries for each of the phone numbers that are yours. The ER model would say that you are an entity, and each phone number is an entity, and the relationship between you and the phone numbers is 'has a phone number'. Diagrams created to design these entities and relationships are called entity–relationship diagrams or ER diagrams.
Using the three schema approach to software engineering, there are three levels of ER models that may be developed. ...
Conceptual data model ... is the highest level ER model in that it contains the least granular detail but establishes the overall scope of what is to be included within the model set.
Logical ER model ... contains more detail than the conceptual ER model. In addition to master data entities, operational and transactional data entities are now defined.
The physical ER model is normally developed to be instantiated as a database. Therefore, each physical ER model must contain enough detail to produce a database and each physical ER model is technology dependent since each database management system is somewhat different.
Physical model ... is normally forward engineered to instantiate the structural metadata into a database management system as relational database objects such as database tables, database indexes such as unique key indexes, and database constraints such as a foreign key constraint or a commonality constraint." [Entity–relationship model. Wikipedia]
This crow's foot entity-relationship diagram (ERD) example "Educational data base" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
ERD
ERD, entity,
Used Solutions

Active Directory, network topology, Active Directory Domain Active Directory Diagrams

Active Directory, network topology, Active Directory Domain
Active Directory Diagrams solution significantly extends the capabilities of ConceptDraw DIAGRAM software with special Active Directory samples, convenient template and libraries of Active Directory vector stencils, common icons of sites and services, icons of LDPA elements, which were developed to help you in planning and modelling network structures and network topologies, in designing excellently looking Active Directory diagrams, Active Directory Structure diagrams, and Active Directory Services diagram, which are perfect way to visualize detailed structures of Microsoft Windows networks, Active Directory Domain topology, Active Directory Site topology, Organizational Units (OU), and Exchange Server organization.

network topology diagram software, network icons, network diagram template, networking icons available, how to draw a network diagram Computer Network Diagrams

network topology diagram software, network icons, network diagram template, networking icons available, how to draw a network diagram
Computer Network Diagrams solution extends ConceptDraw DIAGRAM software with samples, templates and libraries of vector icons and objects of computer network devices and network components to help you create professional-looking Computer Network Diagrams, to plan simple home networks and complex computer network configurations for large buildings, to represent their schemes in a comprehensible graphical view, to document computer networks configurations, to depict the interactions between network's components, the used protocols and topologies, to represent physical and logical network structures, to compare visually different topologies and to depict their combinations, to represent in details the network structure with help of schemes, to study and analyze the network configurations, to communicate effectively to engineers, stakeholders and end-users, to track network working and troubleshoot, if necessary.

graphical user interface, UI patterns, GUI interface iPhone User Interface

graphical user interface, UI patterns, GUI interface
iPhone User Interface solution extends ConceptDraw DIAGRAM software with templates, samples and libraries with large quantity of vector stencils of graphical user interface elements, Apps icons, UI patterns for designing and prototyping of the iOS applic

interactive voice response system, IVR Interactive Voice Response Diagrams

interactive voice response system, IVR
Interactive Voice Response Diagrams solution extends ConceptDraw DIAGRAM software with samples, templates and libraries of ready-to-use vector stencils that help create Interactive Voice Response (IVR) diagrams illustrating in details a work of interactive voice response system, the IVR system’s logical and physical structure, Voice-over-Internet Protocol (VoIP) diagrams, and Action VoIP diagrams with representing voice actions on them, to visualize how the computers interact with callers through voice recognition and dual-tone multi-frequency signaling (DTMF) keypad inputs.
The vector stencils library "LDAP" contains 20 symbols of Lightweight Directory Access Protocol (LDAP) elements for drawing the LDAP Directory Services network structure diagrams.
"The Lightweight Directory Access Protocol (LDAP) is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network. Directory services play an important role in developing intranet and Internet applications by allowing the sharing of information about users, systems, networks, services, and applications throughout the network. As examples, directory services may provide any organized set of records, often with a hierarchical structure, such as a corporate email directory. Similarly, a telephone directory is a list of subscribers with an address and a phone number.
LDAP is specified in a series of Internet Engineering Task Force (IETF) Standard Track publications called Request for Comments (RFCs), using the description language ASN.1. The latest specification is Version 3, published as RFC 4511. ...
A common usage of LDAP is to provide a "single sign on" where one password for a user is shared between many services, such as applying a company login code to web pages (so that staff log in only once to company computers, and then are automatically logged into the company intranet).
LDAP is based on a simpler subset of the standards contained within the X.500 standard. Because of this relationship, LDAP is sometimes called X.500-lite." [Lightweight Directory Access Protocol. Wikipedia]
The symbols example "LDAP - Vector stencils library" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Active Directory Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.
www.conceptdraw.com/ solution-park/ active-directory-diagrams
Country
Country, country,
Organization
Organization, organization,
Organizational unit
Organizational unit, organizational unit,
Generic object
Generic object, generic object,
Locality
Locality, locality,
Alias
Alias, alias,
Person
Person, person,
InetOrgPerson
InetOrgPerson, InetOrgPerson,
Organizational person
Organizational person, organizational person,
Residential person
Residential person, residential person,
Organizational role
Organizational role, organizational role,
Group of names
Group of names, group of names,
Group of unique names
Group of unique names, group of unique names,
Device
Device, device,
cRL distribution point
cRL distribution point, cRL distribution point, cRL, certificate revocation list,
dSA
dSA, dSA, Directory Service Agent,
dmd
dmd, dmd, Directory Management Domain,
Application process
Application process, application process,
Application entity
Application entity, application entity,
Unknown
Unknown, unknown,
Used Solutions

Computer and Network Package

Computer and Network Package is a large set of valuable graphical solutions from ConceptDraw Solution Park, developed and specially selected to help computer network specialists and IT professionals to realize their daily work the most efficiently and quickly. This package contains extensive set of graphic design tools, ready-to-use vector elements, built-in templates and samples for designing professional-looking diagrams, charts, schematics and infographics in a field of computer network technologies, cloud computing, vehicular networking, wireless networking, ensuring networks security and networks protection. It is useful for designing different floor plans and layout plans for homes, offices, hotels and instantly construction detailed schemes of computer networks and wireless networks on them, for making professional-looking and colorful Pie Charts, Bar Graphs and Line Charts visualizing the relevant information and data.

wireless communications, WLAN, wireless solution, wireless networking Wireless Networks

wireless communications, WLAN, wireless solution, wireless networking
The Wireless Networks Solution extends ConceptDraw DIAGRAM software with professional diagramming tools, set of wireless network diagram templates and samples, comprehensive library of wireless communications and WLAN objects to help network engineers and designers efficiently design and create Wireless network diagrams that illustrate wireless networks of any speed and complexity, and help to identify all required equipment for construction and updating wireless networks, and calculating their costs.

network layout, network floor plan, network visualization, network topologies, network topology mapper Network Layout Floor Plans

network layout, network floor plan, network visualization, network topologies, network topology mapper
Network Layout Floor Plans solution extends ConceptDraw DIAGRAM software functionality with powerful tools for quick and efficient documentation the network equipment and displaying its location on the professionally designed Network Layout Floor Plans. Never before creation of Network Layout Floor Plans, Network Communication Plans, Network Topologies Plans and Network Topology Maps was not so easy, convenient and fast as with predesigned templates, samples, examples and comprehensive set of vector design elements included to the Network Layout Floor Plans solution. All listed types of plans will be a good support for the future correct cabling and installation of network equipment.

bubble chart, bubble chart creator, bubble diagram Bubble Diagrams

bubble chart, bubble chart creator, bubble diagram
Bubble diagrams have enjoyed great success in software engineering, architecture, economics, medicine, landscape design, scientific and educational process, for ideas organization during brainstorming, for making business illustrations, presentations, planning, design, and strategy development. They are popular because of their simplicity and their powerful visual communication attributes.

scatter chart, scatter graph, scatter plot Scatter Diagrams

scatter chart, scatter graph, scatter plot
The Scatter Diagrams solution extends ConceptDraw DIAGRAM functionality with templates, samples, and a library of vector stencils that make construction of a Scatter Plot easy. The Scatter Chart Solution makes it easy to design attractive Scatter Diagrams used in various fields of science, work, and life activities. ConceptDraw DIAGRAM lets you enter the data to the table and construct the Scatter Plot Graph automatically according to these data.

UML diagram, UML modeling Rapid UML

UML diagram, UML modeling
Rapid UML solution extends ConceptDraw DIAGRAM software with templates, samples and libraries of vector stencils for quick drawing the UML diagrams using Rapid Draw technology.
▸ ConceptDraw Solution Park ▸ Workflow Diagrams ▸
▸ ConceptDraw Solution Park ▸ Audio, Video, Media ▸
▸ ConceptDraw Solution Park ▸ Business and Finance ▸
▸ ConceptDraw Solution Park ▸ Computers and Communications ▸
▸ ConceptDraw Solution Park ▸ Office Layout Plans ▸
▸ ConceptDraw Solution Park ▸ Computer Network Diagrams ▸
▸ ConceptDraw Solution Park ▸ Entity-Relationship Diagram (ERD) ▸
▸ ConceptDraw Solution Park ▸ Electric and Telecom Plans ▸
▸ ConceptDraw Solution Park ▸ Interactive Voice Response Diagrams ▸