Distinguish between : Hacker and Cracker

Hacker Vs. Cracker: Cracking is a dreadful feeling to know that a stranger has broken into user computer systems without user's knowledge and consent and has tampered with precious confidential data and information. A Cracker differs from the Hacker because hacker is hired by companies to audit network security or test software but cracker do the same work for their own profit or to harm others.