Next.js is a framework for building web applications using JavaScript, React, and other web development technologies. This course, called Next.js Foundations, is designed for beginners and will guide you through the prerequisite knowledge you need to effectively use Next.js. The course is structured as a series of lessons that build on each other, and you can choose where to start depending on your current knowledge and skills. By the end of the course, you will have built a simple project using Next.js.