If you have trouble understanding what is a sequence diagram, this guide will provide everything you need to know, including the definition, notations, how to draw a sequence diagram, best practices, examples, and common mistakes you should avoid when drawing one.
In my previous article, you learned about UML diagrams. In this article, we take a close look at the sequence diagram. The examples provided below are based on the UML 2 specification. The UML 2.0 specification came out in 2005, but the most recent version is now UML 2.5.1 (which came out in 2017).