An antivirus is an essential tool to keep malware, ransomware, and spyware from taking control over your PC. If there is a virus attack, all your personal data may be compromised. Viruses have been known to corrupt files, steal them, and in some cases, even encrypt them. You will be demanded a certain amount of money in order to decrypt the files and regain access to them. Certain malware tools, called rootkits, hide in your computer and can be found only by specific antivirus applications. Antivirus is a necessity in this internet age.