Fax software uses the internet to receive and send faxes. Traditional faxing involves sending a scanned copy of a document (a facsimile) from one fax machine to another, over the phone network. Internet faxing (or "online faxing") is a general term which can refer to one of several methods of achieving this over the Internet - with a goal of both reduced costs and increased functionality over traditional faxing. Depending on the specific method/implementation, advantages of using the internet can include the following - 1. No extra telephone line required for the fax. 2. Paperless communication, integrated with email. 3. Ability to send and receive multiple faxes simultaneously. 4. Massive reduction in phone costs.