On the Forum, What is the Difference Between a "Like" and an "Upvote"?

[Radish]

Kind of puzzling over this today. What is an "Upvote" for? What is it meant to indicate?

Also what is a "Like" for? What is it meant to indicate?

And what is the difference between the two? How are users meant to use them?

[Tripredacus]

It looks like both like and upvote increase the reputation number in your info panel. I believe that the forum has an option to enable a "most popular post" type panel, similar to the Popular Contributors panel that appears on the forum index.