Line Printer Daemon (LPD)
Another TCP/IP upper-layer service that is in widespread use is the Line Printer Daemon (LPD). It resides on a network printer or print server and responds to TCP/IP printing requests from the printing clients (known as LPR clients). It was developed as the printing services for UNIX. But, because of the tight marriage between UNIX and TCP/IP, the LPD service became the default
print service used with TCP/IP.
Note:
A daemon is a program that acts like a terminate and stay resident (TSR) application
by loading into memory and lurking there for any trigger that calls upon its services.
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