You have a contract. But what exactly did you promise, and what did the other side promise? If one of those promises is broken, can you walk away, or are you stuck with just a claim for money? The answer depends on what kind of term it is and whether it really became part of the deal in the first place. This chapter sorts out the different classes of contract terms and the rules that decide when a term—especially a tricky exemption clause—is actually binding.