What does mod_python.publisher handler do?

[yaru22]

I was reading Chapter 6.1 in mod_python manual at www.python.org.

The manual simply says:

The publisher handler is a good way to avoid writing your own handlers
and focus on rapid application development.

I still don't understand what this publisher handler is for.

Can someone elaborate the above phrase with some examples please?

Thanks in advance.

Regards,
Brian