A sale is a transaction between two or more parties in which goods or services are exchanged for money or other assets.
In financial markets, a sale is an agreement between a buyer and a seller that includes the price of a security and its delivery for an agreed upon payment.
An item or service given from one party to another without an exchange of payment is not considered a sale, but rather a gift or donation.
Sales occur 24 hours a day around the world, in all industries and are a major part of the core structure of trade.
Selling can also refer to lowering the price of a product or service in an attempt to attract buyers.