Avast Antivirus is a family of internet security applications developed by Avast Software for Microsoft Windows, macOS, Android and iOS. The Avast Antivirus products include free and proprietary versions that provide computer security, browser security, antivirus software, firewall, anti-phishing, anti-spyware and anti-spam among other services.
As of 2017, Avast is the most popular antivirus on the market, and it had the largest share of the market for antivirus applications.
Avast Free Antivirus – Free for non-commercial and home usage. This product's features include antivirus with antispyware, Avast Passwords, Secure HTTPS scanning, streaming updates, hardened mode, DeepScreen, Home Network Security scanner, Do Not Track, SiteCorrect, antiphishing, anti-malware, Smart Scan, Rescue Disk, and Software Updater (manual), Ransomware Protection. Requires 1-year registration and includes advertisements for other Avast products.
Avast Pro Antivirus – For home use. Includes all features of the Free version, with the addition of SafeZone Browser, Secure DNS, and Sandbox. Does not require registration, but does require a license or activation code.
Avast Internet Security – Includes all the features of Pro, with the addition of a silent firewall and antispam. Does not need registration, but does require a license or activation code.
Avast Premier – Includes all the features of Internet Security, with the addition of a data shredder, an "AccessAnywhere" service, and automatic software updater (for programs such as Google Chrome). Does not require registration, but does require a license or activation code.