The first thing you need to know is "what is Hacking"

Hacking actually means accessing someone's computer system or systems without one's permission or legal authorization. And this someone is known as 'hacker'. A hacker necessarily is not an outsider; it is quite probable that those who work with you hack your systems. It is a common myth that hacking can be done over the Internet only, but this is not the case. It is quite widespread in its approach. Most companies make best of their efforts to ensure the safety of their computer systems from Internet hacking, but unconsciously turn a blind eye to other potential dangers. Thus, it is the need of the hour to know what exactly hacking is, and how to protect your business against its hazardous effects.