A group policy object or GPO can be configured to implement security parameters of a Windows domain, among other things. Different organizations have different security needs, and their GPO settings can vary. Try to imagine your current workplace or a past one where you think a GPO would work well.
What features do you think you would set up in the GPO?
Consider things like passwords policies, allowing someone to log onto a server, and so on.
Talk about a few settings you like and why they would work, and maybe one you do not think would be useful at all. Do not forget to explain why.