Avast antivirus software quickly scans your device, find out, and removes any sort of viruses, Spyware, or any other harmful files. Avast is one of the best providers of antivirus software on the market, with almost all of their products being top notch. Avast Virus Definitions is essentially a support tool for the Avast antivirus tool. Looking for a way to upgrade virus definition files on your Computer System? Annoyed by other antivirus software which does not work properly? Well, then look no further than Avast Virus, as it is the perfect software for you to use.Īvast Virus definition is a free to use tool that has been developed and published by the Company Avast.