Hypermedia is a computer-based information retrieval system that allows non-linear access to various media types, including text, audio, video, images and graphics. It enables users to choose their own path through linked information. Examples include hyperlinks between documents on the World Wide Web and interactive forms. Some key advantages are the ability to quickly follow associations between related materials and annotate or create new references. However, there is also a risk of getting disoriented by too much non-linear browsing. Hypermedia systems are commonly used in educational environments to allow active, self-paced exploration and construction of knowledge.