A hyperlink lets one document open into another, turning web reading into a network of chosen paths.
In 1945 the American engineer Vannevar Bush imagined a desk-sized machine he called the Memex, which would let a reader join pages of microfilm into personal 'trails', long before computers could do anything like it. Ted Nelson, who read Bush's essay, is credited with coining the term 'link' in the mid-1960s at the start of his Project Xanadu, and in 1968 Douglas Engelbart's team showed working links between pieces of text on a real computer in a famous live demonstration. Tim Berners-Lee, working at the CERN physics laboratory near Geneva, joined the idea to the internet: he proposed the World Wide Web in 1989, and in 1991 pages written in his HTML language began linking to one another, so a decades-old idea became something anyone with a browser could click.



