AntivirusAn antivirus is a program used to protect a computer from malware such as viruses, Trojan horses, worms and other malicious programs. In addition to protecting your computer, antivirus offers many solutions to prevent new infections on your computer by scanning emails and files during download. An antivirus program is considered a security strategy. A computer virus is similar to a biological virus; it spreads from one computer to another just like the biological virus spreads from human to human. Computer virus infection is a small piece of software that can harm your computer; interrupts the functioning of the computer, corrupts and erases data. The spread of a virus can occur in numerous ways. The ways a virus can spread are through opening attachments to emails or other types of messages, downloading files from the Internet, visiting unknown websites, and installing untrusted program files. A unique feature of a computer virus that differentiates it from other malware is that it can only spread through human action. The computer virus can be on your computer without you knowing, and the computer virus is only effective when you click on the infected program. A Trojan horse is a program that can see and legitimize software or files but once the program is executed, the damage comes into force. The damage ranges from sending small spam programs to your computer and can go as far as stealing computer data or even destroying and deleting all information from your computer. Through Trojans, hackers are able to break into someone's drive and control their computer remotely. All it takes is a simple click, either by you or the hacker, to infect your computer. A dif... middle of paper...... valuable programs that are best removed unless you are completely sure it won't harm your computer. One way to check if a virus is really a virus, you can upload it to VirusTotal and that program will tell you every detail of the program and define whether the program is a virus. It's really difficult to choose the best antivirus solution for your computer. Obviously we want maximum security to protect our computer from malicious programs, but there are many programs to choose from. The criterion for finding the best antivirus solution for you is reliability, usability, comprehensive protection and quality of protection. I personally use Norton Antivirus because it contains multi-layered malware-fighting technology that many other antiviruses don't have. Multi-layered means it has layers of protection that a virus must overcome to reach and infect your computer.