What type of document helps explain how to assemble or use a product?

A manual is designed specifically to provide clear instructions on how to assemble, operate, or maintain a product. It typically includes step-by-step guidance, diagrams, and safety information to ensure the user can effectively and safely use the item in question. This type of document aims to make complex processes understandable, breaking them down into manageable tasks.

In contrast, a job application letter serves a completely different purpose, focusing on the individual's qualifications and experiences to secure employment. A feasibility report assesses the practicality of a proposed project, analyzing its viability and potential outcomes rather than providing operational details about a product. Similarly, a status report updates stakeholders on the progress of a project or task, providing information about completed work, ongoing activities, and any issues encountered, without offering instructions on how to use or assemble a product. Thus, the manual stands out as the most appropriate choice for explaining assembly or usage.