AVG Antivirus uses several layers of defense to protect your system from attack. The software uses a traditional signature-based protection as a base along with a huge database of known malware. As well as providing virus protection, AVG Antivirus 2015 also protects your computer against spyware, Trojans, worms, bots and root kits whether they pop up in email. The software stops malware in its tracks before you mistakenly download it and also gives you a large amount of information on suspect files should they pop up.