Imagine you're playing with your toys and you make a new friend in the park. Gabriel Tarde was a man who lived a long time ago and he thought about how people make friends and share ideas. He believed that when people interact with each other, they influence each other's thoughts and behaviors, kind of like when you and your new friend play with your toys and share your ideas about how to play.
Tarde also thought that some people's ideas and behaviors become really popular and spread throughout a community, just like when you and your friends in the park start playing a game and then other kids see how much fun you're having and join in.
Overall, Gabriel Tarde believed that people's interactions with each other have a big impact on how they think and behave, and that popular ideas and behaviors can spread quickly through a community.