Crash Course is an educational YouTube channel created by John Green and Hank Green that offers engaging video lessons on a variety of subjects. The channel covers topics in history, science, literature, and more, making complex concepts accessible to learners of all ages. Each episode is typically around 10-15 minutes long and features colorful animations and clear explanations. The series aims to supplement traditional education and encourage curiosity. With over 10 million subscribers, Crash Course has become a popular resource for students and lifelong learners alike, providing a fun and informative way to explore new ideas and deepen understanding.