Fax is an acronym that stands for Facsimile. It refers to a technology that allows you to send and receive printed documents over telephone lines, using special equipment such as fax machines or multifunction printers (MFPs) with built-in fax capabilities. Faxes are often used in business settings where there is a need to quickly share important paperwork, such as contracts, reports, or legal documents. The process involves converting the original document into an electronic signal that can be transmitted over a phone line and then converted back into a printed copy at the receiving end.