PhET Interactive Simulations ( https://phet.colorado.edu/ ), a project of the University of Colorado Boulder, provides fun, free, interactive, research-based science and mathematics simulations for use across, primary, secondary, and higher education levels. We extensively test and evaluate each simulation to ensure educational effectiveness. All simulations are open source and free to all students and teachers. In this course, you will learn how to access and share PhET simulations with your students, and explore the features that make PhET sims a powerful tool for science and mathematics teachers. You will also learn about how to ensure equity in your teaching through the use of active learning. This course is the first one of the specialization 鈥淎ctive Learning in STEM with PhET Interactive Simulations鈥, which includes 4 courses in total. To finish this course, you need to complete one assignment with Peer Review: 1) Selecting PhET simulations. This course is also available in Spanish as 鈥淚ntroducci贸n a las Simulaciones PhET para la Educaci贸n STEM鈥 and in Portuguese as "Introdu莽茫o 脿s Simula莽玫es PhET para Educa莽茫o STEM".