This document discusses the meaning, definition, and characteristics of a good textbook. It begins by defining a textbook as a standard book used for teaching and learning that is organized according to the curriculum. Textbooks are authored by experts in the subject area and take into account the intended readers. The document then discusses the physical and academic aspects that make for a good textbook. Physically, a good textbook has an appropriate size, strong binding, reasonable cost, and clear printing. Academically, it has detailed explanations, relevant content organized by the syllabus, a simple style suitable for the audience, and questions to conclude lessons. Overall, the document emphasizes that textbooks provide organized instruction to aid both teaching and learning.