Avast Home edition is an anti-virus program meant for providing security solutions for day to day computer usage, including surfing the internet. This software is available online for free download but Avast Home Edition anti-virus requires an activation key. This activation key is also free and is valid for one year. Once a necessary form is filled in on the Avast website, this key is sent to users via email, and they can activate it by clicking on the recording button and then pasting the key. After one year, this key expires and needs to be renewed.