Group Policy can and should be used inside any Active Directory domain environment for many different duties. While certainly useful for deploying settings and applications, and for making life easier on your users, in my opinion, those things are far from the most important focus area for Group Policy.
To me, security is the single most important aspect of the capabilities provided to us inside the Group Policy engine. Password policies, firewall rules, application blockers, the list goes on and on. Since Group Policy is basically all-powerful and able to manipulate almost anything on any workstation joined to your domain, it makes all kinds of sense to utilize this platform as your primary mechanism ...
