Udemy.com is an online learning and teaching marketplace offering over 220,000 courses and serving 70 million students. The platform provides a wide range of courses in various fields such as programming, marketing, data science, and more. Users can access courses on-demand, allowing them to learn at their own pace and on their own schedule. Udemy also supports professional development with features like hands-on training, certification prep, and customizable content for teams and organizations. The platform is trusted by over 16,000 companies worldwide, making it a popular choice for both individual learners and businesses looking to upskill their employees.