Digital logic is an important area of electronics. Digital logic can come in a number of forms. A common form is in terms of discrete integrated chips (ICs). They can be plugged into a "breadboard" and wires and other components combined to test and or create bigger more complicated circuits. Here is a demonstration of wiring an AND gate:
Here are some videos that demonstrate the functioning of a number of digital logic gates.
Finally, test your knowledge to see if you can identify the following gates: