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This document provides a clear and systematic explanation of the process of digestion and absorption in humans, as prescribed in the Class XI Biology syllabus. It covers the mechanical and chemical digestion of food starting from the mouth to the small intestine, along with the role of digestive enzymes, hormones, and accessory organs such as the liver and pancreas. The document also explains the mechanism of absorption of nutrients including carbohydrates, proteins, fats, vitamins, minerals, and water, with special emphasis on the structure and function of intestinal villi. Important definitions, key points, and exam-oriented explanations are included to help students understand concepts easily and revise efficiently. This material is especially useful for Class 11 students preparing for school exams, NEET foundation, and competitive exams, as it is written in simple language with well-organized content.