The Brother DCP-J725DW LAN Windows driver is a software package that enables your computer to communicate with the Brother DCP-J725DW printer via a Local Area Network (LAN), typically over Wi-Fi or Ethernet. This printer is a multi-function device that can print, scan, and copy documents, and the LAN driver allows it to connect to your computer over a wired or wireless network. Without the correct driver, the printer won't be able to interact with your computer properly, and you won't be able to send print jobs or access other printer features.