What is a facsimile machine used for?

A facsimile machine, commonly known as a fax machine, is primarily used to send documents over a telephone line. This technology converts a physical document into a digital signal, which can then be transmitted to a receiving fax machine that reconverts the signal back into a physical document. Its main function centers around the transmission of information in a paper format, making it widely used for office communications and document sharing before the rise of digital alternatives like email.

In contrast, the other options focus on different functionalities that a facsimile machine does not perform. Creating digital files involves different technology and processes such as scanners or digital cameras. Storing documents electronically is typically handled by cloud storage solutions or databases, not fax machines. Analyzing data is a function related to data management and analytical software, which is beyond the scope of what a fax machine is designed to do. Therefore, the correct option emphasizes the fax machine's specific role in document transmission.