An instruction book is a type of publication that provides instructions on how to do something. It can be in the form of a GUIDE, MANUAL, or how-to. A GUIDE is a document that provides information about a particular subject or activity. A MANUAL is a book of instructions that explains how to use a product or service. A how-to is a type of document that provides step-by-step instructions on how to do something. All three of these terms are used to describe an instruction book.