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What Is UML Diagram?

UML diagrams are a set of visual representations of software systems. The class diagram is the most notable, which shows the classes within the system and their relationships.


UML diagrams are based on concepts from object-oriented analysis (OOA) and object-oriented design (OOD). OOA/OOD defines how to analyze and design software systems so they are flexible enough to meet changing requirements and support future changes.


UML diagrams use a combination of shapes and lines to represent objects (entities), relationships among objects (associations), operations on objects (behaviors), and constraints on objects or relationships among objects (attributes). The UML specification provides a framework for using these graphical notations but does not dictate how they should be used in an actual project.

Types of UML Diagrams

There are several types of UML diagrams that you can use to convey different types of information about a system. These include:

Class Diagrams

Class diagrams illustrate the various classes in an application and any relationships between them. They also show how objects are related to each other and can be used to depict abstract concepts like interfaces or abstract base classes that define common characteristics among other classes in your code base.

Activity Diagrams

This diagram depicts activities, events, states, and transitions in a process or workflow model. The activities are represented by rectangles with rounded corners, whereas bubbles represent events with pointed ends that denote an activity’s starting or end point.

States are represented by rounded rectangles, which may have multiple exits and entrances but not necessarily for every state shown in a diagram. In contrast, transitions may have multiple outgoing arcs but only sometimes for every transition shown in a diagram.

Collaboration Diagrams

Collaboration diagrams describe how different parts of a system interact with each other. They are often used to model scenarios where multiple objects work together to meet some goal or perform some tasks.

Deployment Diagrams

Deployment diagrams show how different components of an application are deployed on hardware or software platforms such as servers and databases. Deployment diagrams may also show how components interact over networks such as the internet or intranet.

Use Case Diagrams

A use case diagram shows all the actors using the system and how they interact with each other and with the system. The use case diagram is also known as an actor-action-object model because it models the actors, their actions on objects, and the objects themselves.

Sequence Diagrams

A sequence diagram illustrates interactions between objects over time. It shows messages being passed between objects, along with time stamps for each message’s arrival at an object’s inbox and departure from its outbox.

UML Software Tools

Here is a list of some of the most popular UML software tools:


The ArgoUML project provides an open-source, extensible, Eclipse-based modeling tool for creating UML classes, sequences, use cases, and activity diagrams. It is also capable of generating Java code based on UML models.


BOUML is an open-source UML tool that supports the following UML diagrams: class diagram, sequence diagram, activity diagram, collaboration diagram, state machine diagram, and deployment diagram. It also supports the following UML profiles: BPMN (BPMN 1.0 and 2.0) and MDA (MDA v1.0).


PlantUML is a language-independent UML diagramming tool. It can be used to generate code, documentation, and web pages.

Many software developers use PlantUML to document their programs using the Unified Modeling Language (UML). The program is written in Java and available under the GNU General Public License version 3 or later (GPLv3+).

Umbrello UML Modeller

Umbrello UML Modeller is a professional UML modeling tool. It features advanced features such as reusable libraries, context-sensitive help, and an intuitive graphical interface. Umbrello supports multiple platforms (Linux/GTK+2, Mac OS X/Cocoa, Windows 2000/XP) and standards (UML 1.4).

What sets Umbrello apart from other modelers is its open source, based on the Eclipse platform, and developed by a community of passionate users about software modeling. This means that you’ll get frequent updates at no cost!


The Dali project provides an open-source UML tool that is part of the Eclipse Foundation’s Modeling Project. It allows users to create UML diagrams using a graphical interface and offers limited support for importing existing projects into its database for viewing purposes only.


StarUML is a UML modeling tool for software development that can be used to model the static structure of a system, as well as its behavior and dynamic aspects. StarUML provides an easy way to create class diagrams and other diagrams. It supports sequence diagrams, activity diagrams, state charts (like BPMN), deployment diagrams, data flow diagrams (like DFD), package diagrams, and more.


UMLetino is an open-source UML editor that allows you to create, edit and visualize UML diagrams. It’s a lightweight tool that runs on Windows, Linux, and Mac OS X. It’s easy to use and can be used by beginners.

Standout Features Of The Uml Diagram

Several features make UML diagrams stand out from other types of models:

  • They are visual representations of information that makes it easier for users to understand them.
  • They present relationships between objects using arrows, lines, or other shapes representing how they relate to each other in real-life situations or business processes.
  • They can be used at any stage of designing your application or system, as they provide an easy way of documenting what you’re doing at any given time.

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