Copilot Studio is where you go once Agent Builder hits its ceiling. It is the same product whether IT builds something tenant-wide or you build something for your own team. Its building blocks are agents (the conversational layer), workflows (drag-and-drop automations) and agent flows, which run on their own or as a tool an agent can call.
A Studio build can do what an Agent Builder agent cannot: branch on conditions, reach outside systems through connectors, run on a schedule or event, and pause for a human approval step. That extra power comes at a price. Studio-built flows and agents are metered in Copilot Credits, while agents that only use generative answers or standard Microsoft Graph grounding in Copilot Chat are not.