What does it mean when a contract is form?

I think you mean what is a "form contract". It means something preprinted and customary. You can find many on line (for a price) and in form books published by many places (including law publishing companies). If you mean is it a "good" contract, well some are, and most usually favor one side -- like in a lease the landlord, or in a construction contract the contractor... It also doesn't mean you have to accept it but if you don't it's very possible the other side won't agree to work with you or give you what you want. PS terms and conditions of use of web sites are "form contracts" of a kind.