A square meter is a unit of area measurement in the metric system. It is defined as the area of a square with sides that are each one meter long. This measurement is commonly used in various fields, including real estate, construction, and agriculture, to quantify space. In practical terms, a square meter can help determine the size of a room, a piece of land, or any surface area. For example, a room that measures 4 meters by 5 meters has an area of 20 square meters. Understanding square meters is essential for planning and design in projects involving buildings, gardens, or furniture.