Preview one breadboard usage picture first. And you can learn how the pins connected in one breadboard and how to use it. The following is some basic information about breadboard. What is a breadboard? A breadboard is a rectangular plastic board with a bunch of arrayed tiny holes in it. You can easily insert electronic components into these holes to make up a connective circuit for prototyping or testing. There are different sizes and different colors of breadboards like these. You can visit this page to purchase breadboards in good price.