LCARS, the Library Computer Access and Retrieval System, is the computer operating interface used aboard Starfleet ships and facilities in the 24th century.
LCARS presents information on flat touch-sensitive panels with blocks of color, labels and graphics, and it also responds to spoken commands. Officers use it at every station, from the bridge to sickbay, to access ship systems, records and sensor data.
The interface is recognizable by its rounded bars and color-coded segments, a style created for the series by scenic art supervisor Michael Okuda, whose screen graphics became known among fans as Okudagrams.