noun
A file (also referred to as a conf file) that contains Splunk Enterprise (and apps) configuration information. Configuration files are stored in:
$SPLUNK_HOME/etc/system/default
$SPLUNK_HOME/etc/system/local
$SPLUNK_HOME/etc/apps/
Splunk Enterprise and apps write configuration settings into configuration files. You can configure settings and processes by editing stanzas within copies of the default configuration files.
In the Admin Manual: