Microsoft has had a lot of naming blunders in the past but this has to be their worst. Copilot is currently, a tool to review PRs on github, the new name for windows cortana, the new name for microsoft office, a new version of windows laptop/pc, a plugin for VS code that can use many models, and probably a number of other things. None of these products/features have any relation to each other.

So if someone says they use Copilot that could mean anything from they use Word, to they use Claude in VS Code.