Distance learning is a way of teaching and learning where students and teachers are separated by time or space, do not meet in a classroom, and use the Internet or alternate means of sharing course materials and communicating. It can refer to any sort of teaching that is done outside a traditional classroom, including paper-based correspondence courses or technology-supported elearning, like this course in DD Courses. It includes courses where a teacher is there to support students, and also courses students work through on their own without a dedicated instructor. Since the Internet is the most common way to offer distance learning, we will refer to technology-based systems for the most part, but the content we cover here is applicable for other distance learning choices as well.