Spoofing

Mail Spoofing is a technique of hiding the true identity and pretending to be somebody else in email.

IP Spoofing is a technique of hiding the true identity pretending to be somebody elses machine (e.g., pretending you are the trusted Intranet host when actually you are the untrusted Internet host).Practical implementation of this technique is rather difficult.

Web Spoofing is pretending to be somebody elses web site.