# UML Diagrams

UML Diagrams: Common UML Diagrams.

Updated: November 3, 2026

1. [Common UML Diagrams](https://www.ask-codey.com/lessons/uml-diagrams-common-uml-diagrams) (Apprentice): UML is a shared way of drawing software. A use case diagram shows who uses the system and for what, a class diagram shows the classes and how they're related, and a sequence diagram shows the messages that pass between parts, in order. Sketch them to think and to explain.

Source: https://www.ask-codey.com/courses/csharp-full-stack-bootcamp/topics/uml-diagrams