A breadboard is a reusable platform used for building and testing electronic circuits without soldering. It consists of a grid of holes that allow components like resistors, capacitors, and integrated circuits to be easily inserted and connected. The internal connections are made through metal strips, which help establish electrical pathways between components. Breadboards are popular among hobbyists and students because they enable quick prototyping and experimentation. They come in various sizes and can accommodate different types of electronic components. Using a breadboard allows for easy modifications and adjustments, making it an essential tool in electronics education and development.