Jelly vs Jam vs Preserves

I have a giant container of lemons so I wanted to make lemon preserves or marmalade and then I wondered.. 

what is the difference between types of canned fruits?

Here is what I discovered:

jelly: the fruit comes in the form of fruit juice.
jam: the fruit comes in the form of fruit pulp or crushed fruit (and is less stiff than jelly as a result).

preserves: the fruit comes in the form of chunks in a syrup or a jam.