Using something and change it, and make it do what you want with it.
Commonly used in the opensource communety becose every one can (re)use eatch other source code.

Confusing a computer program to give you access to that machine is also a hack. Doing this becose you want to test securety is a white hat
Intendedly useing a hack to take over that pc to do your bidding is a cracker or black hat.

Downloading hacks and try them to gain access to a computer with out knowing that it realy does is a script kiddy

Hacking is the gaining of access(wanted or unwanted) to a computer and viewing, copying, or creating data(leaving a trace) without the intention of destroying data or maliciously harming the computer.

This represents the Good Guys most of the time for they are the ones who search for these exploits to prevent crackers use a method called cracking(opposite of hacking).

Hacking and hackers are commonly mistaken to be the bad guys most of the time. Crackers are the ones who screw things over as far as creating virus, cracks, spyware, and destroying data.


References:
Cracker - Person who gains unauthorized access to a computer with the intention of causing damage.

Cracking - Method by which a person who gains unauthorized access to a computer with the intention of causing damage.

Hacker - Person who gains authorized/unauthorized access to a computer WITHOUT the intention of causing damage.

Spyware - A Program that was created by a person(most frequently a cracker) to watch the computer and it's actions and report the details to the origional maker.

Virus - A maliciously made program that is used to destroy data, or hurt the performance of the computer. Makes copies of itself and sends it to more ...

To really,really get inside a female/male while sexual intercourse just to really get something huge out of it.

continual play of drum licks after instructor has cut off group.

Hacking is a broad term used to describe many complex activities wherein the end goal is typically to obtain access to a computer system's servers, database(s), or stored files. This access may be any combination or desired or undesired, and legal or illegal.

Legal and condoned hacking is known as "white hat" hacking, and is used to test the security of a given computer network by hiring an individual or group of individuals to try to break in to it electronically, in order to determine the network's flaws or lack thereof.

Illegal or unwanted hacking is known as "black hat" hacking, however the term "cracking" is often used to describe malicious or malevolent hacking in which the end goal is to cause damage to the integrity of the targeted computers, whether to destroy, copy, or modify files, or possibly to install easy routes back into the system known as "backdoors".

Not all condoned hacking is legal, however. For example, if Jim's friend challenges him to hack or crack into his home computer, and Jim does so, it is still technically illegal despite the consent of his friend. Legal hacking (in the United States of America) needs to be approved with paperwork and status of employment; hobbyist hacking is generally always illegal.

Techniques for hacking vary intensely, and can incorpora...

1. finding possible exploits in software codes as to make it do your bidding. may be good (jailbreaking) or bad (cracking, piracy, virus, etc)

2. posting "i'm gay." or "i'm so hot." in a facebook account of a person who forgot to log out.

The act of operating a car as an illegal or unlicensed taxi service.

In the United Kingdom, the name hackney carriage refers to a taxicab licensed by the local authority. The New York colloquial term "hack" (which is probably derived from "hackney carriage") refers to a taxi or taxi-driver.