So, frozen berries, are great. sometimes I use them in foods I cook. Sometimes I cook them down for syrup on sauces.

Jelly and jam are slightly different.
Jelly is made only from the juice of fruit
Jam is made from juice, and from the flesh.

I actually don't eat Raspberries, but my wife and 2 daughters love it... so, I make Raspberry Jelly for them. Also, I use the Raspberries for Making Raspberry Liqueur.