Hacking V/S Cracking
Hacking is a particular type of illegal activity which endangers the privacy and security of important on line information.Hacking challenges  the utility of the mechanisms which are used to secure a communication  network. It is important here to note that although hacking is used  interchangeably with cracking, both are different. Both the activities  are carried on with different objectives. In hacking, the attempt is to  create something while in cracking the primary motive is to destroy  something.
Purpose behind Hacking
When  somebody tries to access others computer systems with the aim of  destroying or altering important information or data, such an activity  is defined as hacking and the person is called a hacker. It is believed  that hacking activities are not backed by solid logical reasons. On the  contrary, hackers try to experiment with the computer brilliance by  trying of affect other system with viruses. Hacking is done mostly for  sheer pleasure by which a hacker wants to prove his skills. But if at  all one searches for reasons behind it, it can be logically concluded  Hacking is carried out with the objective of tracing vital information  and affecting computer systems with viruses. 
Hackers
Hackers  are generally computer geniuses because it is due to the extraordinary  computer knowledge and skills that they can conveniently break into  other computer systems. They are also known as crackers. In fact, many  brilliant aspects and functioning of computers are invented by the  hackers. Hackers need to be very cautious in what they are doing and  how. They pre plan their mode of action before starting with a new  venture. Hence, hacking, in spite of its being an unwanted and illegal  crime involves lots of prediction and intelligence.
Advantages of Hacking
- By hacking into company A, which is competed by company B, Company B will know A's information.It is good for B's development and improvement.
- Hackers can receive so much good information and have fun.
- Hacking tools are used to test the security of a network, pc etc.
- It can have free calls,yahoo,stealing one's mail and much more.
Cracking
Cracking  is the act of breaking into a computer system, often on a network. A  cracker can be doing this for profit, maliciously, for some altruistic  purpose or cause, or because the challenge is there. Some  breaking-and-entering has been done ostensibly to point out weaknesses  in a site's security system.
                  Contrary  to widespread myth, cracking does not usually involve some mysterious  leap of hackerly brilliance, but rather persistence and the dogged  repetition of a handful of fairly well-known tricks that exploit common  weaknesses in the security of target systems. Accordingly, most crackers  are only mediocre hackers. These two terms should not be confused with  each others. Hackers generally deplore cracking.
Cracker
A  cracker is someone who breaks into someone else's computer system,  often on a network; bypasses passwords or licenses in computer programs;  or in other ways intentionally breaches computer security. A cracker  can be doing this for profit, maliciously, for some altruistic purpose  or cause, or because the challenge is there. Some breaking-and-entering  has been done ostensibly to point out weaknesses in a site's security  system.
The difference between hacking and cracking
Hacking,  and cracking. Two different forms of Internet and computer related  privacy and copyright breaches, usually malicious. I'll be discussing  the differences between hacking, and cracking. They are two completely  different things, but people usually get confused between the two, they  both end with a similar sound, or 'acking' (that's probably why!) and  they're both malicious forms of cyber activity. I'll be talking about  the difference between hacking, and cracking. 
- Let's start off by explaining what the words mean, in computer vocabulary - that is. Hacking, is the act of stealing personal or private data, without the owner's knowledge or consent, it could also include other things like stealing passwords, creating a bot net, or pretty much any act that breaches someone's privacy, without their knowledge, or consent.
- Now, on to cracking. Cracking is where edit a program's source code, or you could create a program, like a key generator (more commonly known as a 'keygen'), patch, or some sort of application that tricks an application in to thinking that a particular process has occurred. For example, a key generator and a patch for the Adobe Master Collection would trick the software in to thinking that the key entered is correct, and not let it verify the key with the Adobe master server. Cracking is pretty much looking for a back door in software, and exploiting it for malicious use or for a copyright breaching act.
The  difference (if you have not noticed it yet) is that a hacker is someone  that uses their extensive knowledge of computer logic and code for  malicious purposes, while a cracker - looks for back doors in programs,  and exploits those back doors. Cracking is generally less harmful than  hacking. Hackers are usually involved with web related hacking, like  MySQL interception, or phishing, other forms of hacking would include  things like brute force, or password lifting.
            Well, the difference is simple. One is more malicious than the  other, crackers usually have an extensive knowledge in code related to  Python and .NET (Visual Basic, C, C++, C#) and Objective C (Mac), while  hackers are fluent in different forms of web code, like PHP, MySQL, Java  Script , Ajax, and HTML and CSS. I hope, after reading this, we all  have got what the difference between hacking, and cracking are.  Basically, it's just what they do, that's the difference. 
Conclusion
In  my opinion, Hacker uses their knowledge to only help the security of  systems where as Cracker will use their knowledge to break the law. the  terms are used interchangeably but they are not the same, to some it can  be considered an insult to be called a Cracker over a Hacker. Hacking is a serious present day problem and important steps must be taken against it. 
 
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