How Many Times Can You Jump From Different Parks In One Day With Disney Hopper Option?

I’ve never been to disney world before and I would like not to be confined to one park per day. So I thought I would get the hopper option with my ticket. But how does it exactly work? If I wanted to go to Epcot in the morning and then I went to Animal Kingdom but when I get in to that park I find I rather go to Magic Kingdom would I be able to do that in one day with the hopper option? Are you only able to hop once between parks per day? Does it actually give you the freedom to go to all four parks in one day or two?