What type of UML diagram to choose?

Question

Software design

It is necessary to describe the user registration process with checking the password and email address. What type of chart to use, and if possible, help with examples

Answer 1

In UML, two types of diagrams are used for these cases: Activity (activities) and Sequence (sequences). An activity diagram is more suitable for describing algorithms, with branches, conditions, etc. A sequence diagram is more suitable for describing the interaction of components in the implementation of some scenario. That is, the first is more about logic (or business logic), and the second is about implementation in the system.
In your case, apparently, the sequence diagram is most suitable, here is an example:

Answer 2

Diagram of activities.