What does the Intrusion tag mean?

This tag describes situations where suing/sending party makes claim based on the tort of "intrusion" or "intrusion upon seclusion." These types of claims are sometimes labeled "invasion of privacy" claims by a suing/sending party. Note that there are other species of "invasion of privacy" torts as well -- "false light" and "publication of private facts" -- so try to determine which type is implicated in a particular situation.