Relational Frame Theory, or RFT, is a way psychologists explain how humans make sense of the world. We don’t just learn words on their own—we learn the connections between them. If you know a dime is smaller than a quarter, you instantly understand that a quarter is bigger than a dime. Nobody has to teach you both sides. That ability to connect and flip ideas is uniquely human, and it’s what allows us to think abstractly, solve problems, and feel the depth of emotions we do.