Faxing is a method of sending documents over a telephone line. A fax machine scans a physical document, converts it into a digital signal, and transmits it to another fax machine, which then prints a copy of the document. This process allows for quick and secure sharing of information, especially in business settings. Although less common today due to digital communication methods like email, faxing is still used in various industries, including healthcare and legal fields, where signed documents are often required. Many businesses also use online fax services to send and receive faxes without needing a physical machine.