What is the difference between them (WMS VAS Activities / Work Area Activity WFM /Custom Activities)

Summary:

I can see these 3 screens in my WMS and all these 3 screens shows different Activities.

I need to know what the difference is between these screens.

1. WMS VAS Activities
2. Work Area Activity WFM
3. Custom Activities

Content (please ensure you mask any confidential information):

Just want basic difference between these screens, and why are multiple screens there for activities

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

25A

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

N/A