What is S mode in windows?

[LJSDesigns]

I finally decided to set up my new laptop and it has S mode in windows. I want to have dropbox on it, but it says I will have to go out of S mode and once I do that, S mode will no longer work. So what is S mode and how important is it to have it?

(BTW, I hate setting up new computers. Hate it.)

[TraceyM]

I looked for an answer. Reddit had an interesting one that is obviously not promoted from Microsoft.
https://www.reddit.com/r/Windows11/comments/15ee4wf/just_got_my_very_first_laptop_what_is_s_mode/