With all three representing a door to your computer, Avast does a great job of watching these entrances. Avast's free software provides three shields to protect your computer: a file system shield, an e-mail shield, and a Web shield. The application's onscreen tools are well-organized, and its live graphics enhance the feeling of safety - you can see that the antivirus software doesn't sleep and is always working to protect you from any viruses circulating on the Web. The application is packaged with a brand-new, easy-to-understand graphical user interface, with access to all features available at single click. Avast Free Antivirus for Mac is Avast's answer to concerns about how to browse safely.