What must occur for an acceptance to be valid?

For an acceptance to be valid, it is crucial that it must be received by the offeror. This principle is based on the "mailbox rule," which states that a communication is effective when it reaches the offeror. Until the offeror receives the acceptance, they cannot treat the agreement as binding. Therefore, simply sending an acceptance does not create a contract; the offeror must be made aware of the acceptance for it to be valid.

While acceptance in writing is often preferred and some agreements require it to be written, it is not a strict requirement for all forms of acceptance. Additionally, the response must come from the offeree, not the original offeror, as the parties involved are distinct in a contract scenario. Furthermore, acceptance does not need to be effective immediately upon sending; rather, it must be received in order for the contractual obligations to begin.