A sieve is a tool used to separate wanted elements from unwanted material or for controlling the particle size of a mixture. It typically consists of a mesh or perforated material that allows smaller particles to pass through while retaining larger ones. Sieves are commonly used in cooking, such as straining pasta or rinsing vegetables, as well as in construction and laboratory settings. Sieves come in various sizes and shapes, including round, square, and rectangular forms. They can be made from different materials, such as metal, plastic, or cloth. The process of using a sieve is often referred to as sieving, which is essential in many fields, including cooking, construction, and science.