Questions about the Nagios Remote Plugin Executor, a monitoring agent add-on for the Nagios software package.
NRPE is an acronym for the Nagios Remote Plugin Executor software agent installed to remotely monitor computer systems.
From the Nagios support site:
NRPE allows you to remotely execute Nagios plugins on other Linux/Unix machines. This allows you to monitor remote machine metrics (disk usage, CPU load, etc.).