who are hackers?

Hacker: "The person who practices hacking is called a hacker". They know all the information including system structure, operation, how it works, which will be hacking the system. Before the computer was not so prevalent, hacker was hacking the phone. Calling on the phone was called Phreaker and the process is called Phreaking. They used to hack various telecommunication systems and use it for their own needs.

There are three types of hackers: let's say the hackers are identified with a hat or hat. 1. White Hat Hacker (White Hat Hacker)

Gray hat hacker (Gray hat hacker)
Black hat hacker (Black Hat hacker)