<human>: What are the differences between a fax machine and a copier?
<bot>: The main difference between a fax machine and a copier is that a fax machine sends and receives documents over analog phone lines, while a copier uses digital technology to copy documents. A fax machine can send and receive images of documents, whereas a copier only copies them. Additionally, a fax machine typically has more advanced features such as automatic dialing, voice recognition, and remote printing capabilities.