The flight control station of a 24th-century Starfleet bridge, combining the old helm and navigation posts, from which one officer steers the ship.
Conn, short for flight control, is the forward bridge station from which a Starfleet ship of the 24th century is steered. It joins the tasks that were divided between the helmsman and the navigator in Kirk's day, when Sulu and Chekov sat side by side: one officer now plots the course, sets the speed and flies the ship.
On the Enterprise-D the seat changes hands often. Geordi La Forge holds it in the first season, Wesley Crusher takes it as an acting ensign and later as a full one, and Ro Laren and a line of junior officers follow. The phrase passing the conn also survives in its older naval sense of handing over command of the bridge.
Aboard Voyager the station is Tom Paris's from Caretaker onwards, and his skill as a pilot is a large part of how he wins back his standing in Starfleet.