Spare parts are components that can be replaced in machines or devices when the original parts become worn out or damaged. They are essential for maintaining the functionality and longevity of equipment, such as cars, appliances, and industrial machinery. Having spare parts on hand can help reduce downtime and repair costs. These parts can include anything from engine components in vehicles to circuit boards in electronics. Manufacturers often produce spare parts to ensure that customers can easily find replacements for their products. This practice supports sustainability by extending the life of existing items rather than requiring complete replacements.