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, enabling quick adjustments and modifications. Breadboards are popular among hobbyists and students because they simplify the process of prototyping. They come in various sizes and can accommodate different types of components, making them versatile tools for learning about electronics and developing new projects. Many beginners use breadboards to experiment with circuits before creating permanent versions on printed circuit boards (PCBs).