Cooperative learning is an instructional approach where small groups work together to solve problems or create a product. It was introduced in the 1960s as an alternative to individualistic learning. There are different types of cooperative learning groups defined by their duration, from informal groups lasting a few minutes to formal and base groups that can last weeks or years. Key elements that define cooperative learning include positive interdependence, face-to-face interaction, individual and group accountability, interpersonal skills, and group processing. Effective implementation requires understanding social interdependence, validating research, incorporating the five basic elements, and recognizing cooperative learning's flexibility.