What is Spoofing?

Spoofing meaning in Internet terms is Definition: Faking the sending address of a transmission to gain illegal [unauthorized] entry into a secure system.
Extended Definition: The deliberate inducement of a user or resource to take incorrect action. Note: Impersonating, masquerading, piggybacking, and mimicking are forms of spoofing.
From: CNSSI 4009


reference: Glossary | National Initiative for Cybersecurity Careers and Studies