Definition:Hacking is an attempt to exploit a computer system or a private network inside a computer.simplyput, it is the unauthorized access to or control over computer network security systems for some illicit purpose.
Description:To better describe hacking,one needs to first understand hackers.one can easily assume them to be intelligent and highly skilled in computers.in fact,breaking a security system requires more intelligence and expertise than actually creating one.There are no hard and fast rules whereby we can categorize hackers into neat compartments.However,in general computer parlance,we call them white hats,black hats and grey hats.Grey hats diffee from black hats in the sense that the former notify the admin of the network system,whereas the latter is only looking for personal gains.all kinds of hacking are considered illegal barring the work done by white hat hackers.
