Line driver

Not to be confused with line drive, a type of batted ball in baseball or softball.

A line driver is an electronic amplifier circuit designed for driving a load such as a transmission line. The amplifier's output impedance may be matched to the characteristic impedance of the transmission line.

Texas Instruments DRV632 - DirectPath, 2-VRMS Audio Line Driver with Adjustable Gain

Line drivers are commonly used within digital systems, e.g. to communicate digital signals across circuit-board traces and cables.^[1]

In analog audio, a line driver is typically used to drive line-level analog signal outputs, for example to connect a CD player to an amplified speaker system.^[1]