Web Forwarding - How does it work ?

[Steve Tobin]

I am currently working my way through 'DNS and BIND' but nowhere can I
find an answer to my question.

Many Domain Registration companies offer 'Web Forwarding' which appears
to redirect a domain name to a given URL e.g. http://www.newdomain.com
goes to http://www.anotherdomain.com/newdomain ("Park your domain at
your ISP's free web space" they say).

Does this really work and if so how do they do it ?

Hoping someone can help !

Steve Tobin