This document describes UML 2.5 and is based on OMG™ Unified Modeling Language™ (OMG UML®) 2.5 specification. A sequence diagram is the most commonly used interaction diagram. UML guides the creation of multiple types of diagrams such as interaction, structure and behaviour diagrams. Unified Modelling Language (UML) is a modeling language in the field of software engineering which aims to set standard ways to visualize the design of a system. Sequence diagrams are a popular dynamic modeling solution in UML because they specifically focus on lifelines, or the processes and objects that live simultaneously, and the messages exchanged between them to perform a function before the lifeline ends.

Sequence Diagrams are time focus and they show the order of the interaction visually by using the vertical axis of the diagram to represent time what messages are sent and when. They capture the interaction between objects in the context of a collaboration. UML Sequence Diagrams are interaction diagrams that detail how operations are carried out.

Draw a sequence diagram online