An offer is a proposal from one party to another intending to create a legal obligation upon acceptance. Acceptance in contract law is when a person agrees to the terms of an offer without any changes.Parties may form a contract through conduct rather than merely through the exchange of communications constituting 'offer and acceptance. Georgia law applies the "mailbox rule", which makes acceptance of an offer effective upon depositing the acceptance in the mail. Offer and Acceptance: The buyer makes an offer to purchase the property, which the seller can accept, reject, or counter.