A square meter is a unit of area measurement in the metric system. It represents the area of a square with each side measuring one meter in length. This unit is commonly used in various fields, including real estate, architecture, and agriculture, to quantify space. For example, a room that is 4 meters long and 3 meters wide has an area of 12 square meters. Understanding square meters helps people compare sizes of different spaces, such as homes, gardens, or offices, making it easier to plan and utilize areas effectively.