What is fax number?

A fax number is a telephone number that is used for sending and receiving documents electronically via a fax machine. It allows users to send physical documents such as contracts, letters, and forms over a telephone line to another fax machine. In order to send a fax, the sender inputs the recipient's fax number into their own fax machine, inserts the document into the machine, and presses send. The document is then received and printed out by the recipient's fax machine. Fax numbers are typically formatted like regular phone numbers, with a country code (if sending internationally), area code, and local number. Fax numbers are commonly used in industries such as healthcare, law, and government where physical documents are still required for legal or security reasons.