How is a request like www.xyz.com/ABCD or www.xyz.com/ABCD?x=1 processed at the server end?

Since there is no extension specified (for e.g. ABCD.php or ABCD.aspx), what does the server do?

I've seen quite some such URLs and was curious as to just how it works. Thanks in advance

It's accomplished using URL Rewrite techniques. This is a fairly common practice. One of the main purposes of using URL rewriting is to allow for the use of SEO friendly URLs. However, there are many other reasons why to use it such as for redirection.

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