This document defines and discusses textbooks. It begins by defining a textbook as a book containing compiled content about a subject intended to explain that subject. Textbooks are produced to meet the needs of educators, especially in educational institutions. The document then discusses how textbooks are carefully prepared by experts, are indispensable study tools for subjects like social sciences, and provide uniform standards and a base for teachers and students. It notes cautions around overreliance on textbooks and advantages such as organizing course content. While textbooks can help planning, the document also lists disadvantages like potentially dull content and narrowing student outlooks.