Square feet is a unit of area measurement commonly used in the United States and other countries that follow the imperial system. It represents the area of a square with each side measuring one foot in length. For example, a room that is 10 feet long and 10 feet wide has an area of 100 square feet. This measurement is often used in real estate to describe the size of homes, apartments, and commercial spaces. Knowing the square footage helps buyers and renters understand how much space they will have, making it easier to compare different properties and make informed decisions.