This textbook is tailored to GNM students and aligns with the syllabus of the Indian Nursing Council. It introduces microbiology in clear, accessible language, covering microorganism classification, structure, growth, pathogenesis, immunity, specimen collection and biosafety. Rich in diagrams, tables and model questions, the book emphasises point-wise explanations and practical relevance for nursing practice. With MCQs, short notes and long questions in each chapter, it supports exam preparation and day-to-day application for nursing learners.