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. The receiving machine then prints out a copy of the document, allowing for quick and efficient communication. Although less common today due to digital alternatives, faxing is still used in various industries, such as healthcare and legal services, where secure document transmission is essential. Many businesses also use online fax services to send and receive faxes via email or the internet, making the process more convenient.