What is the difference between the Form rules and the Collection rules?

Summary:

Please tell me the the difference between the Form rules and the Collection rules.

Content (please ensure you mask any confidential information):

I read the following documents but I couldn't understand them.

When I created the Collection rules, the screen wasn't displayed, so I have a vague understanding that I should use the Form rules.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):