A user's manual is a document that provides instructions and guidance on how to use a product. However, there are other terms that can be used to describe similar documents. One example is an instruction manual, which is a written guide that explains how to assemble and use a product. Another synonym is a guidebook, which provides information on how to use something, often with illustrations or diagrams. Additionally, a handbook is a comprehensive guide that covers all aspects of a product or process, while a reference manual provides in-depth information on specific features or functions. Regardless of the term used, these documents serve as valuable resources for users to maximize their understanding and utilization of a product.