How does fax machines use Array scanning?

Fax machines use array scanning by employing a series of sensors that capture the image of a document as it passes through the machine. The document is scanned line by line using a light source, where an array of photodetectors converts the reflected light into electrical signals. These signals are then encoded into a digital format and transmitted over telephone lines to the receiving fax machine, which reconstructs the image. This method allows for efficient and quick transmission of documents.