This document discusses the essentials of proposals and revocation in contract law. It defines a proposal or offer as signifying a willingness to do or abstain from doing something. A proposal must have clear terms, be communicated, intend to create legal relations, and be possible to accept. A proposal can be revoked through notice, lapse of time, death or insanity of the offeror, counteroffer from the offeree, or subsequent illegality. Revocation refers to canceling or annulling something by authority, such as withdrawing an offer before acceptance.