The term “spoofing” is generally regarded as slang, but refers to the act of fooling — that is, presenting a false truth in a credible way. Most types of spoofing have a common theme: a nefarious user transmits packets with an IP address. The first step in spoofing is determining the IP address of a host the intended target trusts. After that, the attacker can change the headers of packets to make it seem like the transmissions are originating from the trusted machine.”]
Source: https://www.csoonline.com/article/2115848/data-protection-ip-spoofing.html