A breadboard is a reusable tool for building temporary electronic circuits. Components and jumper wires are pushed into small holes that are connected internally in rows and rails.
Why breadboards are useful
They let students, hobbyists, and engineers test ideas quickly without soldering. If something is wrong, parts can be moved or replaced easily.
When a breadboard is not enough
Breadboards are great for learning and simple prototypes, but they are not ideal for high-frequency circuits, high-current circuits, rugged products, or final manufacturing. A finished design usually moves to a PCB.
A breadboard is the sketch pad of electronics: quick, flexible, and temporary.