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A user is a regular Steemian like you and me.

A curator is an account (either a person or a group) that curates content, and is authorised to upvote and/or flag content by a user.

Then what is the difference between a user's upvote and a curator's upvote?

When a user upvotes a post, it counts as one upvote.

When a curator upvotes a post, his vote is combined with all the users who have authorised him to vote on his behalf. So if a curator has a hundred people in his trail, each upvote is counted as 101 upvotes (the 101st is his). [At least, that's if I'm recalling the mechanism properly.]

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