Typical Chmod Permissions Values
664 or -rw-r--r--   web pages and images viewed by surfers.
666 or -rw-rw-rw-  - log files or pages that are written to.
755 or -rwxr-xr-x  - perl scripts to make them executable.
755 or -rwxr-xr-x  - directories are usually given this value.
777 or -rwxrwxrwx  - for files that are written to by all.
777 or -rwxrwxrwx  - directories that have files created inside them.

What is Owner, Group and Other?
Owner - the user/owner of a file or directory.
Group - individuals who are in the same group.
Other - users that are not the owner or part of the group.