This document discusses the concepts of offer and acceptance in contract law. It defines an offer as an expression of willingness by one party to enter an agreement with another party. It lists the basic characteristics of a proposal or offer, including that it must be communicated to the other party, be definite, include clear terms and conditions, and not obligate the other party to reply. The document also defines acceptance as signifying assent or approval to the terms of an offer and notes the essentials of a valid acceptance, such as being absolute, unconditional, and communicated within a reasonable time period before the offer lapses.