Let Us C (20th Edition) by Yashavant Kanetkar is the definitive guide to learning and mastering the C programming language. Written in simple and engaging language, it introduces readers to the world of coding through a gradual, step-by-step approach. The book covers essential topics like variables, operators, control statements, loops, arrays, functions, pointers, structures, and file handling — all explained with examples and exercises for practice. It also includes practical programming challenges to help learners strengthen their logical thinking and problem-solving skills. Recognized as one of the most popular programming books in India and abroad, Let Us C is perfect for beginners, engineering and computer science students, and anyone starting their journey in programming.