Includes - Allow server-side includes. Server-side includes allow an HTML file to include other files. This is not a common option. See the Apache2 SSI Howto for mor information.

IncludesNOEXEC - Allow server-side includes, but disable the #exec and #include commands in CGI scripts.

Indexes - Display a formatted list of the directory's contents, if no DirectoryIndex (such as index.html) exists in the requested directory.

    [Caution]    
   

For security reasons, this should usually not be set, and certainly should not be set on your DocumentRoot directory. Enable this option carefully on a per-directory basis only if you are certain you want users to see the entire contents of the directory.

Multiview - Support content-negotiated multiviews; this option is disabled by default for security reasons. See the Apache2 documentation on this option.

SymLinksIfOwnerMatch - Only follow symbolic links if the target file or directory has the same owner as the link.