! Type of classroom !! Where it's found !! Typical distinguishing characteristics
| School classroom where the learners form a "section" of the school student body that studies many subjects together || At least up till middle school and in many cases up till high school in many countries || Students in the school are grouped (primarily based on age) into grades (classes). Students within each grade are grouped into sections. For the most part, students in the same section attend all courses together, and are usually tied to a single physical room (exceptions may includes classes that require specific equipment or more specialization, such as physical training and music).
| School or college classroom where students have signed up for a course together || Most college and university courses are structured like this. Some high school elective courses are also similarly structured. In the United States, this mode of education is seen middle school onward || The set of learners is the set of students who have signed up for a course, and more specifically for a particular section of the course with the specific instructor. The act of signing up may be constrained by various factors, such as degree requirements that cause them to sign up, availability of slots, time constraints, and prerequisite requirements imposed by the educational institution. In most such cases, the majority of students are close by in educational stage (e.g., the same year of college) but there could be a few students at much earlier or later overall educational stages; there could also be courses where the set of learners is not clustered around a specific educational stage.