What is the difference between Jelly and Jam? I honestly want to know.

I've never understood the difference.

Can someone please clarify things for me?

I just don't understand the difference between the two. Concord Grape Jam versus Grape Jelly?

What?

I just don't know.

So maybe I'm dumb for not knowing... But I asked my parents about this too and they had no idea. My brother had no idea either.. Then again.. He's my brother and if you knew him.. You would understand too. =)

You would be my freaking Jelly Jam Angel if you could figure this out for me.

I love you people for putting up with my randomly dumb questions.