Amazon Mechanical Turk (MTurk) is a groundbreaking platform that connects businesses and researchers with a global workforce to complete microtasks, offering workers flexible income opportunities and requesters scalable solutions. Launched in 2005, MTurk has reshaped the gig economy, enabling tasks from data annotation to surveys to be crowdsourced efficiently. This chapter introduces MTurk’s history, its role in the gig economy, key terminology, and the benefits and challenges for workers and requesters. Whether you’re a worker seeking to earn extra income or a requester looking to leverage human intelligence, this book will guide you to success.