The LP print service is a set of software utilities that allows users to print files while users continue to work. Originally, the print service was called the LP spooler. LP represents line printer, but the meaning now includes many other types of printers, such as laser printers. Spool is an acronym for system peripheral operation off-line.

The print service consists of the LP print service software, any print filters you might provide, and the hardware, such as the printer, system, and network connections.