A breadboard is a construction base for prototyping of electronics.
Originally it was literally a bread board, a polished piece of wood used for slicing bread. In the 1970s the solderless breadboard became available and nowadays the term "Breadboard" is commonly used to refer to these.
"Breadboard" is also a synonym for "Prototype". Because the solderless breadboard does not require soldering, it is reusable.
This makes it easy to use for creating temporary prototypes and experimenting with circuit design.
For this reason, solderless breadboards are also extremely popular with students and in technological education.