When you put your mouse cursor over a picture, that's a hover. When you click and go to the profile, that's a visit. Hover gives you a short bio, while a visit shows you the whole thing.

Thanks I had no idea either

You see more when you go to a full profile. The hover gives you a snapshot.

My Android has none of this! LOOOOVVVE MY ANDROID!

Hovering can happen when your mouse strays.

To me, nothing.
If/when I do either, it's usually always by accident.

On the desktop website view, it's possible to hover over someone's name with your mouse (e.g., in the comments) and see a brief description of that person's basic information displaying without clicking and actually visiting the profile. I found the hover alerts annoying, though, and not especially useful, so I disabled them in my account settings from showing up.

I think hovering is when you mouse pointer passes over the link to someone's profile and makes a little window popup with a profile summary. Visiting is when you click on the link and actually go to the full profile. Hovering can be done unintentionally. I get those popups all the time from just moving my mouse around.

Hovering is checking someone out while they walk past. Visiting their profile is stalking