A sequence diagram is a Unified Modeling Language (UML) interaction diagram that represents the logic of how objects within a system interact with each other to execute a scenario. This diagram is used in business analysis and software engineering as it can be illustrated at various levels including for a single scenario or an entire system. A key feature of the sequence diagram is that it demonstrates the order (sequence) in which these events take place, which is why it is the next level of detail following use case diagrams. You can learn more about use cases below:

Use Case Diagram Tutorial:    • Use Case Diagram Tutorial and EXAMPLE...  
Use Case Description:    • Use Case Description EXAMPLE [ Use Ca...  

The sequence diagram is drawn in two dimensions (vertical and horizontal axes) to provide additional context for the sequence of events. Sequence diagrams are also used to illustrate the interaction between user interfaces and software components.

In this video tutorial, I'll be discussing what a Sequence Diagram is, and the various levels of detail, including system sequence diagrams (SSD), Sequence Diagram Best Practices, and an Example of a Sequence Diagram. I'll also be examining the main components of the sequence diagram including topics, object boxes, actors, activation boxes, lifelines, messages, return messages, and combination fragments, such as alternatives, options, and loops.

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Not How to Make a UML Sequence Diagram, or UML Sequence Diagram Tutorial | Easy to Understand with Examples, but UML Behavioral Diagrams: Sequence Georgia Tech Software Development Process, with UML Sequence Diagrams, but not Sequence Diagram Step by Step Guide with Example, or 5 Steps to Draw a Sequence Diagram, or Sequence Diagram in UML | Software Engineering, but How to make Sequence diagram with example, and 3 types of Sequence Diagram, as well as How to make a UML Sequence Diagram in PowerPoint, but not Sequence Diagram for Login Page System, or How to Make Easy UML Sequence Diagrams and Flow Charts with PlantUML, and UML UseCase and Sequence Diagrams Made Simple | Step by Step Guide | UML Diagrams | Geekific. In this video, The Business Analysis doctor shares an overview of the sequence diagram.