Pleasure principle (psychology)

The pleasure principle is a concept in psychology that people are driven to seek out pleasure and avoid pain. It basically means that you'll do things that make you feel good, and avoid things that make you feel bad. For example, if you like ice cream, you're more likely to eat it when it is available than if you don't like it. On the other hand, if you don't like taking tests, you'll tend to try and avoid them.