Hacking is the act of finding the possible entry points that exist in a computer system or a computer network and finally entering into them. Hacking is usually done to gain unauthorized access access to computer system or a computer network .either to h arm the system or to steel sensitive information available on the computer.
Hacking is usually legal as long as it is being to find weakness in a computer system for testing purpose.This short of hacking is called Ethical Hacking.
A computer expert who does the act of hacking is called “hacker”. Hackers are those who seek knowledge,to understand how system operate ,how they are designed, and then attempt to play with these system