Viruses are small files that attach to emails or downloads and infect your computer - which is why you need virus protection.
A virus is a small software program that corrupts or erases your files, and it can spread itself via e-mail to other computers. They can be as harmless as displaying funny pictures on your monitor or they can go through your address book and send everyone within your address book the same virus. More dangerous versions can completely wipeout your computer and all your information and some can take over your machine and send spam from your computer. Without your knowledge, you can become a spammer. When downloading an e-mail attachment, such as a photo that appears to be from someone you know, you'll want an antivirus program to scan the file to make sure it's free of malware. A good program updates itself to fight the latest viruses, runs regular computer scans without your assistance, and lurks in the background while you work or have fun to find suspicious activity and stop it cold.
Antivirus computer software is an essential component of every user's security arsenal. Viruses and other malware pose a significant danger to your security and system functions.