What's the difference between Requests and Tasks?

What's the difference between Requests and Tasks?

We are just getting started with ServiceDesk Plus. When is it appropriate to use a request vs. a task? Requests can have many tasks, but does that mean every request should have a task? We have set up some request templates that require work from multiple technicians. Is this a good place to use tasks - one task per technician/step?

Related: As a technician, how do I know what I need to work on right now? It seems there is no way to see something like "my active requests and tasks" on one screen.

Thank you very much.