A Breadboard is a rectangular plastic board with a bunch of tiny holes in it. These holes let you easily insert electronic components to prototype (meaning to build and test an early version of) an electronic circuit, like this one with a battery, switch, resistor, and an LED (light-emitting diode). 

The leads can fit into the Breadboard because the inside of a Breadboard is made up of rows of tiny metal clips. This is what the clips look like when they are removed from a Breadboard.

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