Configuration or "config" file used on Unix and Linux based systems; stores settings for system processes and applications; similar to a .CFG file found on Windows and Macintosh systems.
Some examples of configuration files include rc.conf for the system startup, syslog.conf for system logging, smb.conf for the Samba server, and httpd.conf for the Apache Web server.
Common CONF Filenames:
httpd.conf - The Apache HTTP Server configuration file containing "directives" that configure what features are enabled for the Web server. It is often located in the /etc/httpd/ directory on Unix-based systems.
Plain text configuration file used by various programs; may contain software parameters, user preferences, and other settings; typically is sectioned and marked up with application-specific keywords and values.
An example of a program that uses CONF files is Subversion, a version control system used by software developers.