Offer and acceptance analysis is a traditional approach in contract law used to determine whether an agreement exists between two parties. Agreement consists of an offer by an indication of one person (the "offeror") to another (the "offeree") of the offeror's willingness to enter into a contract on certain terms without further negotiations. A contract

Contract

A contract is an agreement entered into by two parties or more with the intention of creating a legal obligation, which may have elements in writing. Contracts can be made orally. The remedy for breach of contract can be "damages" or compensation of money. In equity, the remedy can be specific...

 is said to come into existence when acceptance of an offer (agreement to the terms in it) has been communicated to the offeror by the offeree and there has been consideration bargained-for induced by promises or a promise and performance.

The offer and acceptance formula, developed in the 19th century, identifies a moment of formation when the parties are of one mind.