Obex refers to a connection establishment protocol that is used in digital devices to facilitate data transfer between two devices via Bluetooth. Synonyms for obex include Object Exchange Protocol, OBject EXchange, Bluetooth OBEX, and OBEX Protocol. The protocol is widely used in mobile devices such as smartphones and tablet computers to transfer files between devices. Other phrases that can be used to refer to this protocol include Bluetooth File Transfer, Bluetooth OBject Transfer, and OBEX File Transfer Protocol. Regardless of the phrasing, the use of this protocol enables users to transfer files between devices without the need for cumbersome cables or other physical connections.