I used to go to office.com to use web versions of Word, Excel, Powerpoint.
Imagine my pleasant surprise (/s) when recently I went there, and the icons for these apps had vanished. Instead there was a giant gaping textbox for Copilot. A minute or so of staring at it, and I noticed a "Create" link on the left. That led to a page that invited me to do various things (e.g. "create a presentation", presumably with the web version of PowerPoint). The icons were still missing though.
Also notable: My work-issued Windows computer has Copilot, and Copilot 365. I have no idea which does what, and what's the difference between the two.