True OER are freely available electronic resources (textbooks, videos, lesson plans, software) that are free of most restrictions, i.e you can:
Affordable Learning Materials include OER but they also include library resources and services (articles, eBooks, videos, course reserves) and other open access online materials. These items are licensed and have some use restrictions but they are free to the students.
For the purposes of this site we'll be using the all-encompassing term Affordable Learning Materials
Affordable Learning Materials give instructors more flexibility in how they design their courses while allowing for the possibility to ditch the traditional textbook which in turn: