How to do a wget

[Bond]

On Tue, Nov 23, 2010 at 5:45 PM, Alan Pope <popey at ubuntu.com> wrote:
>
> wget -m --no-parent
> http://www.cs.fsu.edu/~baker/devices/lxr/source/2.6.25/ldd-examples/
>
> -m = mirror
> --no-parent = it won't go 'up' the tree and spider the entire website.
> just from ldd-examples 'downwards'.
>
Ummm, I think I had checked that option before posting the question
here but any ways thanks for this it is working.
What I still could not understand from the man page is

"Do not ever ascend to the parent directory when retrieving
recursively.  This is a useful option, since it guarantees that only
the files below a
           certain hierarchy will be downloaded."

Why do we need to use this option at all?
Can wget not go in subdirectories and download all of the folders below it?