(styled avast!) is - both freeware and payable - an antivirus computer program with user interface that includes 41 languages, available to Microsoft Windows, Mac OS X and Linux users. The name Avast is an acronym of "Anti-Virus – Advanced Set". The official, and current logo of Avast! is a white orb with the letter 'a' on it and an circle around it, sticking out to four directions.
Its developer, AVAST Software a.s. (formerly known as ALWIL Software a.s.), has headquartered in Prague, Czech Republic, with offices in Linz, Austria; Friedrichshafen, Germany; and San Mateo, California.
It has been awarded VB100 Award by Virus Bulletin multiple times for 100% detection of "in-the-wild" , and also won the Secure Computing Readers' Trust Award. The central scanning engine has been certified by ICSA Labs and West Coast Labs' Checkmark process.
Avast! competes in the antivirus industry against Avira, AVG Technologies, Bitdefender, F-Secure, Frisk, Kaspersky, McAfee, Symantec and Trend Micro among others.
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