A social machine is a group of people who work together like parts of a machine to help solve a problem or achieve a goal. It's like how your fingers, hands, arms, and other body parts work together when you play catch or ride a bike.
In a social machine, people use tools like computers, phones, and the internet to communicate with each other and share information. They also follow rules and procedures to make sure everyone is working together towards the same goal, kind of like when you and your friends play a game with rules to make sure everyone is playing fair.
Social machines are used in many different ways, from solving science problems to building online communities. They bring people together to work towards a common goal and help us accomplish things we couldn't do alone.