A belt drive is a mechanical system that transmits power between two or more rotating shafts using a flexible loop called a belt. This belt is typically made of rubber or other durable materials and runs over pulleys attached to the shafts. Belt drives are commonly used in various machines, such as automobiles, lawn mowers, and industrial equipment, due to their simplicity and efficiency. Belt drives can be classified into two main types: open and crossed. In an open belt drive, the shafts rotate in the same direction, while in a crossed belt drive, they rotate in opposite directions. This system allows for smooth power transfer and can accommodate varying distances between shafts, making it a versatile choice in many applications.