Lighting.

Last night in class I learned the difference between a lightbulb, lamp, and light fixture.
Lightbulb = A pop culture word we use for a lamp.
Lamp = What is commonly referred to as a lightbulb. What actually emits light.
Light Fixture = Usually called a lamp. Where we put a lamp.

Image found on a tumblr I was stalking, and cannot remember which one.