Copilot (Microsoft Copilot)
Japanese Copilot（コパイロット）
Copilot is Microsoft's AI assistant that answers questions and drafts text in its own app and inside Word, Excel and Outlook. The free personal version and paid work versions share the name, so it helps to know which one you are using.
Copilot is the name of Microsoft's AI assistant. You can chat with it in a web or phone app or in the Edge browser, and inside Word, Excel, PowerPoint and Outlook it helps draft documents and summarize email. Like a co-pilot on a plane, it helps from the next seat, but you still hold the controls and make the final call. The same name covers a free personal app, in-app features in paid plans, and a work version used with a company account, which makes it easy to mix them up.
Watch out Before using it for work, check that you are signed in with your work account, not a personal one. Microsoft says that with a work account, prompts and answers are protected under the same contract terms as company email and files. GitHub Copilot, which writes program code, is a separate product that only shares the name.
Source: Sources: What is Microsoft Copilot? (Microsoft Learn), Microsoft Copilot Plans for Individuals (Microsoft), About GitHub Copilot (GitHub Docs)