Connectivism is a learning theory developed for the digital age that asserts knowledge is distributed across networks and that learning occurs through connections within networks. It builds upon behaviorism, cognitivism, and constructivism. According to connectivism, learning involves connecting specialized information sources, nurturing and maintaining connections, and the ability to see connections between fields, ideas and concepts. Connectivism supports online and blended learning by facilitating asynchronous and synchronous connections between learners and information networks. Critics argue it is not truly a learning theory and is an extension of constructivism, while proponents believe it addresses learning in a digital context in a way previous theories did not.