1. Network security
Networks have become a central feature in many people's lives, both for personal and business use. The internet is a network of networks and so each of those networks needs some security features in place.
The topic of keeping computers and networks safe is called 'cyber security'.
Cyber security can be defined as the set of measures taken to protect a computer from harm to its data and software. It also includes the protection of computer networks from unauthorised access.
A 'cyber attack' is an attempt to gain unauthorised access to, or control of, a computer and the network to which it is connected.