Avast (styled "avast!") is a name brand for a
set of antivirus software developed by AVAST Software s.r.o. for
Microsoft Windows, Mac OS X, Android and Linux users. The software
products have a user interface available in 45 languages. The name
Avast came from "Anti-virus – Advanced Set," a program developed by
the company's founders.
AVAST Software s.r.o. currently produces security freeware and shareware programs under the Avast brand for personal and commercial uses on PCs, Macs, and Android devices, and as of 2013 more than 200 million devices worldwide were reported to have used Avast products. In January 2014, Avast had 15.9% of the worldwide security vendor market share.
Avast products work by utilizing the 230 million devices
protected worldwide to act as sensors, finding and reporting
threats from all over the globe. Threats are then automatically
analyzed in the cloud, and SMS-sized updates are issued
approximately every 6 minutes; the protected devices are thus kept
Avast Free Antivirus — freeware for non-commercial/home usage, and is nothing but an antivirus/anti-malware package with no added features. Requires registration and includes advertisements.
Avast Pro Antivirus — suitable for both home and business use and includes all features of the Free edition with a few extras. Does not require registration.
Avast Internet Security — for both personal and commercial use and includes all the features of Pro with more, and also does not need registration.
Avast Premier — the same as Internet Security, with the addition of a data shredder and automatic application updater.