Once a legally binding offer is made by party A and accepted by party B, a legally binding agreement is formed. Providing all the other elements necessary for contract formation are present, a contract is formed. There are specific rules related to acceptance. If acceptance does not meet these rules, there is no agreement; consequently, no contract is formed.
What is acceptance?
Acceptance is an unconditional agreement to all the terms of an offer. This unconditional agreement, or acceptance can be made orally, in writing or by conduct.
Acceptance and Communication
Acceptance usually takes effect when it is communicated to the offeror.
To find out more about the rules on acceptance and communication, watch this video.