A spare tire is an extra tire carried in a vehicle to replace a flat or damaged tire. It is typically smaller and lighter than regular tires, designed for temporary use until a full-sized tire can be repaired or replaced. Spare tires can be found in various forms, including full-size spares, compact spares, and inflatable spares. Most vehicles come equipped with a spare tire, along with tools like a jack and lug wrench for changing tires. Regularly checking the condition and pressure of the spare tire is important to ensure it is ready for use when needed. Proper maintenance can prevent issues during emergencies on the road.