digital circuit - technical definition

An electronic circuit that accepts and processes binary data (on/off) according to the rules of Boolean logic (AND, OR, NOT, etc.). See chip and Bebop to the Boolean Boogie.

Digital Plumbing!
A digital circuit can be conceptualized as a mass of plumbing. The circuit paths are the pipes, the transistors are the valves and the electricity is the water. Imagine opening a valve, and the water that passes through it and down a pipe will eventually reach a second valve, causing it to turn on, allowing water in another pipe to flow through it that reaches another valve, and so on.