Pega is one of the Bpm(Bussiness process management) tool.

Bpm is methodlogy to manage process and workflows in organisation the goal of this methodlogy to increase efficency,performance agility in a day to day operation Bussiness.
Pega Acess groups:
Acess groups means permissions
pega containg different acess permissions

Devloper

User

BussinessAnalyst

Manager

Administrator
 permissions to acessing

Pega BackEnd  is  "Java" code run