Fax machines are electronic devices that allow users to send and receive documents over a telephone line. They were widely used in the past for sending paper documents quickly over long distances, but have become less common with the rise of digital communication.  When deciding what fax machine to purchase, there are several factors to consider.  Functionality: Determine the specific features that are important to you, such as the ability to send color documents or the capacity for multiple pages.  Connectivity: Decide whether you prefer a traditional fax machine that connects to a phone line or a digital fax that sends documents over the internet.  Volume: Consider the volume of faxes you expect to send and receive. Some fax machines are designed for low-volume use, while others are built for high-volume business use.