"Most of our projects are tested using a small piece of plastic known as a breadboard. Officially, it's known as a 'solderless breadboard' because it enables you to use circuit parts without soldering them together.
Electrical components are connected by pushing them into the holes in a breadboard. These holes are connected in strips, as shown in the main image. If you push a wire, or a different component, into one hole in a strip, and another wire into the hole next to it, it's as if you'd physically joined (or soldered) the two wires."
"The easiest way for beginners to get started with Arduino is by creating circuits using a solderless breadboard. These simple projects will teach you the basics of Arduino Uno, electronics and programming. In this tutorial, you will be creating circuits using the following electronic components:
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