A breadboard is a flat, rectangular board used for building and testing electronic circuits without soldering. It features 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 modifications and experimentation. Breadboards are commonly used in educational settings and by hobbyists to prototype electronic designs. They come in various sizes and can accommodate different types of components. Using a breadboard helps users visualize circuit layouts and troubleshoot issues before creating a permanent version on a printed circuit board (PCB).