The document discusses hand gesture recognition. It defines what gestures are and how gesture recognition works by interpreting human gestures through mathematical algorithms. This allows humans to interact with machines naturally without devices. Examples of applications include controlling a smart TV with hand movements and using gestures for gaming. The document outlines the hardware and software needed for gesture recognition, including a webcam, processor, RAM, and operating system. It also provides an overview of the module structure involved in identifying and applying gestures as inputs.