Amazon Mechanical Turk is a crowdsourcing internet marketplace enabling individuals and businesses to coordinate the use of human intelligence to perform tasks that computers are currently unable to do.

Employers are able to post jobs known as Human Intelligence Tasks (HITs), such as choosing the best among several photographs of a storefront, writing product descriptions, or identifying performers on music CDs. Workers can then browse among existing jobs and complete them in exchange for a monetary payment set by the employer.