What's the difference between jelly, jam, marmalade, preserves, and fruit spreads?

They all look the same and they pretty much taste the same when spread on biscuits, toast, or bagels.  There must be a difference between them all.  In fact, it's pretty simple.  The difference between these designations lies in the form of the fruit contained.

Jelly - the fruit is in the form of juice; for Jam - the fruit is in the form of pulp; if you eat Preserves - the fruit is in the form of larger chunks

Marmalade - the term is usually applied to citrus preserves (oranges, lemons, limes, etc); and lest we forget - Fruit Spread - is just a jam or preserve made without sugar.