The term 'hacker' is commonly used in the media to define someone who breaks into a computer usually via the internet to either to gain information or to take control of the system. However, this is only a correct definition in the right context.
The term hacker was originally used to described a computer enthusiast who uses code to create new programs and applications. This kind of hacking is often used in business to fix bugs in computer software or to customise programs to make them more suitable for use.
It is important therefore to ensure that the term 'hacker' is used correctly.
For more information about the positive aspect of hacking, check out the Hackerspace website