Code.org is a nonprofit dedicated to expanding access to computer science education. It produces online curriculum taught in over 100,000 schools worldwide. Code Studio is Code.org's free online curriculum for K-5 students, which includes self-guided video lessons. The curriculum is divided into courses by grade level, blending online tutorials with offline activities. Code.org also provides professional development for teachers and resources for computer science education from middle school through high school, including Exploring Computer Science and AP Computer Science courses.