A Raspberry Pi is a small, affordable single-board computer that is widely used for learning programming and electronics projects. Its compact size and versatility make it ideal for a variety of applications, from DIY home automation to robotics. The Raspberry Pi supports several operating systems, including Linux, and offers GPIO (General Purpose Input/Output) pins for interfacing with other hardware. Its accessibility and extensive community support have made it a popular tool for hobbyists, educators, and professionals looking to prototype and experiment with technology and software projects.