To spoof something is to falsify or otherwise fake information.
The most common use of the term of late is with respect to email. Specifically, the sender of an email – the information that appears in the “From:” line – is easily (and therefore frequently) falsified by spammers. This is known as “From: spoofing”.
As a result, an email’s “From:” line can be:
Spoofing is, of course, not limited to email, or email “From:” information. Various aspects of almost any information can be spoofed for various reasons and with varying degrees of success.« Back to Glossary Index