Treehouse is an online learning platform that offers courses in web design, web development, and mobile development. The platform was founded in 2011 by Ryan Carson and has since become a popular choice for individuals looking to learn these in-demand skills. Treehouse offers a range of courses, from beginner to advanced, and covers a wide range of topics such as HTML, CSS, JavaScript, Python, Ruby, and more. The courses are designed to be interactive and engaging, with videos, quizzes, and coding challenges to help students retain the information they learn. In addition to its courses, Treehouse offers a variety of other features to help students succeed, such as a supportive community of learners and instructors, personalized learning plans, and the ability to earn badges and certifications upon completion of courses.