This interactive lesson introduces the core concepts of input, processing, and output - essential for understanding how computers work. Learners identify common input and output devices, discover how processing connects the two, and apply their knowledge through quizzes, matching activities, a Venn diagram, and a computer set-up task. A fun, gamified challenge reinforces learning and encourages critical thinking. Ideal for beginner-level computer science classes, this lesson builds key digital skills and supports computational thinking in a practical and engaging way.