Definition & Meaning of "shill"in English

What is the origin of the term "shill" and how is it used?

"Shill" is a slang term that appeared in English in the early 20th century, likely from carnival and con artist culture, referring to someone who secretly helps a scam or promotion by pretending to be an enthusiastic customer. The word may come from a shortened form of "shillaber" or from carnival slang for a decoy. It came to describe anyone who dishonestly promotes a product, service, or idea for personal gain. It is used in informal speech, journalism, and online discussions to accuse someone of deceitful or manipulative promotion. The term is derogatory and context-dependent, targeting dishonesty rather than the person's inherent character, but it carries strong negative judgment.