Final answer:
Generally, advertisements are not considered offers as they lack a specific commitment to sell, but instead are invitations to negotiate or make an offer, with a legal offer requiring definite terms to form a binding contract.
Step-by-step explanation:
Generally, advertisements do not constitute an offer because they do not contain a specific commitment to sell. Advertisements are typically considered invitations to negotiate or invitations to make an offer, where the specifics of the sale such as price, quantity, and the terms of sale will be established during the negotiation. A legal offer must contain definite terms that, if accepted, form a binding contract. For an advertisement to be considered an offer, it must include clear language that shows a firm intent to enter into a contract upon acceptance, such as specifying the number of items available at a certain price or indicating a reward.