A rectangle is a four-sided shape, known as a quadrilateral, with opposite sides that are equal in length. It has four right angles, each measuring 90 degrees. The longer sides are called the length, while the shorter sides are referred to as the width. Rectangles can vary in size but maintain their defining characteristics. Rectangles are commonly found in everyday objects, such as books, tables, and screens. They are also used in various fields, including architecture and design, due to their simple and efficient shape. The area of a rectangle can be calculated by multiplying its length by its width.