Find is a Linux command use for searching a file or files in a directory hierarchy. It is help full to search for a file or directory based on name, size, type and access/modified time etc and as well as can execute command on results.
Basic Syntax for Find command :
find (name/size/type/access or modified date) ..argument ..argument
Search for file ending .conf
find /etc/ -name *.conf
Search for directories ending with *conf
find /etc/ -type d