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Sting Operation from WikiPedia:

In law enforcement, a sting operation is a deceptive operation designed to catch a person committing a crime. A typical sting will have a law-enforcement officer or cooperative member of the public play a role as criminal partner or potential victim and go along with a suspect's actions to gather evidence of the suspect's wrongdoing.

• Deploying a bait car (also called a honey trap) to catch an auto thief
• Setting up a seemingly vulnerable honeypot computer to lure and gain information about crackers
• Also a sting operation is known as a scorpion which can be helpful in catching criminals on motorbikes.

Federal agents or ATF arranging someone under the legal drinking age to ask an adult to buy an alcoholic beverage or Tobacco products for them.Posing as someone who is seeking illegal drugs, contraband or child pornography to catch a supplier; or as a supplier to catch a customer.Posing as a child in a chat room to lure a child molesterAn undercover officer posing as a potential customer to bust a prostitute (in the case that he/she does it illegally).An undercover officer posing as a prostitute to bust a potential "customer" (in the case that being a customer of a prostitute is illegal).

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