Radare2 is a computer program that you can use to examine and analyze other computer programs. It is like using a magnifying glass to look at the inside of a program. Radare2 can tell you what the program does, what it looks like, and how it can be changed (or 'hacked'). It can be used to make changes to the program, such as removing bad code or adding new features. Radare2 is used by people who are interested in understanding how computer programs work and how they can be used to do things in new and different ways.