What is a led driver, led light power supply, LED Assemblies

 100 - 277Vac, 44.1W, 1050mA, 24-42V, [0-10V, TRI...], IP20 LED Driver

https://www.futureelectronics.com/p/semiconductors--Led-lighting-components--led-driver-modules-rev--constant-current-acdc-led-drivers/esm050w-1050-42-erp-power-2120290