Sale is a noun that refers to the exchange of a commodity for money or the act of selling something.
Common usages of sale include:
1. "For sale" - available to be bought
2. "On sale" - being sold at a reduced price
3. "Sales department" - the division of a company responsible for selling products
4. "Sales tax" - tax levied on the sale of goods and services
5. "Clearance sale" - a sale to clear out merchandise