The PhET Interactive Simulations project, or simply PhET, is a free online educational platform that provides interactive simulations and activities for learning physics, chemistry, biology, math, and other sciences. The platform is designed for students of all ages, from elementary school to college level, as well as for educators who are looking for engaging and effective ways to teach science concepts.

PhET simulations are based on research into how people learn and are developed by a team of educators, scientists, and software developers at the University of Colorado Boulder. The simulations are designed to be intuitive and easy to use, with colorful graphics, animations, and interactive elements that allow users to explore scientific concepts and phenomena in a hands-on way.