Understanding PC security terms

  • Free Which? guide helps you get to grips with major computer security terms and buzzwords
  • Easy-to-understand A-Z definitions of everything from adware to zombies
  • Internet security jargon explained in plain English

Which? Archive

This article, Understanding PC security terms, was last updated on 17 January 2009 and is now out of date and held in our online archive for reference. Explore our latest Technology articles.

What's in this guide

Adware to DoS attacks

How does anti-virus software work and what does it protect against? Find out here

Firewall to phishing

Firewalls, hackers, key loggers and phishing explained

Rogue diallers to spyware

What effects can a spyware infection have on your computer and what exactly is a computer virus?

Trojan to zombie

Everything you need to know about Trojans, viruses, User Account Controls, worms and zombies