A flipped classroom is an instructional strategy where direct instruction moves from the group learning space to the individual learning space, such as watching online lectures at home, and the group space is transformed into a dynamic, interactive learning environment where students apply concepts and engage creatively in their own learning. It allows for more one-on-one time between teachers and students, more collaboration time among students, and self-paced learning, though it requires self-discipline, relies on technology, and may face resistance to change.