The document discusses online collaboration for teaching and learning. It defines collaboration as people working together towards a common goal or purpose, with symmetry and interdependence. Collaboration is distinguished from cooperation, which involves separate tasks and roles with one overall goal. Different types of collaboration are described, including formal, non-formal, and informal collaboration occurring through curriculum, parallel to curriculum, or in everyday life respectively. Online tools that can enable collaboration, such as wikis, word clouds, photos, and social networks are also mentioned.