A hoax is a deliberately fake story, trick, or deception meant to fool people into believing something untrue. Unlike an honest mistake or a misunderstanding, a hoax involves someone intentionally creating false information and presenting it as real.

Some hoaxes are meant as pranks. In 1938, actor Orson Welles broadcast a radio drama about Martians invading Earth that sounded like real news reports. Many listeners who tuned in late didn't realize it was fiction and believed aliens had landed in New Jersey. While Welles intended it as entertainment, it caused real panic.

Other hoaxes are more malicious. Someone might create a hoax email claiming a school is closed when it isn't, or spread false rumors about a person to damage their reputation. Online hoaxes spread especially quickly because people share dramatic stories without checking if they're true.

History is full of famous hoaxes. In 1869, workers “discovered” a ten-foot tall stone giant in New York that people paid money to see, but it turned out to be a carved fake buried there on purpose. The Piltdown Man hoax fooled scientists for 40 years with fake fossil “evidence” of early humans.

The key element of any hoax is deception. The person creating it knows it's false but works hard to make others believe it's real. Once exposed, a hoax can make people feel foolish for being tricked, which is why hoaxers are rarely trusted afterward.