Within each course, students are provided with “lessons” that encompass all the resources to teach, convey, reinforce, and help the student learn and master a concept. Each lesson begins with a video lecture in which a teacher presents a single, specific concept or a few concepts that are tightly intertwined. Acellus high-resolution videos give students the information and instruction they need to master the course material, creating the feeling of a one-on-one learning experience.