The document discusses flipped classrooms, which is a type of blended learning that delivers instructional content online for students to engage with outside of the classroom. This allows class time to be used for activities, discussions, and applying content. Benefits of flipped classrooms include making content reusable, allowing student-controlled learning, and increasing engagement. However, some teachers argue against flipped classrooms due to concerns about student motivation, keeping all students on the same pace, difficulty testing students, and unreliable internet access.