A service manual is a comprehensive guide that provides detailed instructions on how to maintain, repair, and troubleshoot a specific product or system. It typically includes diagrams, specifications, and step-by-step procedures to help users understand the workings of the item, whether it be a vehicle, appliance, or electronic device. These manuals are essential for technicians and users alike, as they ensure proper handling and care of the product. By following the guidelines in a service manual, individuals can extend the lifespan of their equipment and resolve issues effectively, minimizing downtime and repair costs.