An acre is a unit of area commonly used in the United States and other countries to measure land. One acre is equivalent to 43,560 square feet, which is about the size of a football field without the end zones. It is often used in real estate and agriculture to describe the size of properties or fields. In farming, an acre can represent how much land a farmer has to grow crops or raise animals. For example, a small farm might have 10 acres of land, allowing the farmer to cultivate various crops like corn or wheat. Understanding acres helps people make informed decisions about buying or selling land.