HP Officejet 5610 All-in-One Printer, Fax, Scanner, Copier HP Officejet 5610 All-in-One Printer, Fax, Scanner, Copier https://www.gadgetspeak.com/gadget/article.rhtm/130124/437474/HP_Officejet_5610_MFU.html As a MFU it not only prints, scans, copies but also for those who still require it can send and receive faxes. The latter is the difference between an MFU and a All In One.