Microsoft’s rapid expansion of Copilot across products has created both excitement and confusion. This chapter explains what Copilot actually represents within the Microsoft ecosystem and why different Copilot experiences exist. Readers will learn how Copilot functions as the interface layer for AI and how agents extend its capabilities. By the end of the chapter, you will understand why Copilot appears in many places and how to choose the right Copilot experience for different scenarios.