The document discusses the history and concepts of hypertext. It describes how Vannevar Bush first conceived of hypertext in 1945 with his idea of memex, and how Ted Nelson later developed the Xanadu project in 1967 based on this. Modern computers now allow interlinking various media types within hypertext systems. While hypertext enables non-linear exploration and linking of information, it can also discourage focused thinking if users get lost surfing endless links. The document outlines applications of hypertext in education and language learning.