What are Linux source RPMs for?

[futuristicmonkey]

As title says, what are Source RPM packages for? Are they of any use to me? I'm using Fedora Core 3, kernel 2.6.10-1.741_FC3 if that changes anything.

Thanks,

 

[n0cmonkey]

Source code.

 

[Nothinman]

So that you can compile your own RPMs from the source easily.