This document defines consideration and outlines its essential rules and types under contract law. It states that consideration is something of value that each party provides to make a contract enforceable. The rules are that consideration must move at the desire of the promisor, can come from the promisor or third party, and can be past, present or future. There are also exceptions to the general rule that an agreement without consideration is void, such as agreements on account of natural love/affection or to compensate for past voluntary services. The types of consideration are past (valid in India but not England), present, and future consideration.