This document discusses the topic of revocation of an offer in contract law. It provides examples of different ways an offer can be revoked, such as through notice of revocation by the offeror before acceptance, lapse of time if the offer is not accepted within a reasonable period, failure to fulfill conditions specified in the offer, death or insanity of the offeror or offeree, a counteroffer by the offeree, subsequent illegality making performance of the offer impossible, destruction of the subject matter of the offer, or acceptance not being provided in the prescribed manner specified by the offeror. The key points are that an offer can be revoked in several situations defined by contract law and examples are given to illustrate different types