How anti-virus software works and its limitations. 

Anti-virus software works by scanning your files to detect any viruses.
It checks all files before they are downloaded to prevent them infecting your system.

It needs to be kept up to date so it can recognise the latest viruses.
Anti-virus software cannot always stop attacks on your systems vulnerabilities or security flaws. 

Antivirus should I choose for windows? | Steven Kendy PIERRE