The document discusses learning centers, which are physical spaces that allow students to learn independently or in small groups using various multimedia materials and teacher guides. Learning centers originated in the 1960s-1970s based on open educational systems that supported self-learning and group activities. Learning centers can be divided into dry carrels containing non-electric materials and wet carrels containing electric materials like computers. The advantages of learning centers include self-paced learning, active learning, and flexible teacher roles, while the disadvantages include high costs and time required for planning.