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Fountain pens replaced standard metal pens because they were easier to use and were less messy. After years of improvements (and after appearance of ballpoint pens which are even easier to use) they became a sort of status symbol. Read more about history of fountain pen.
Dip pens were one of the first mass-produced writing tools. They replaced quills and although an old invention they are still in use but more for drawing than for writing. Read more about history of dip pen.
Digital Pens enable users to digitize their writings instantly on real paper, drawings and quick scribblings, share them online or edit them for professional use. Find out much more about this technology here.
Quills were the most sophisticated writing instruments for a long time (some 15 centuries). Many large birds gave their contribution to the spreading of knowledge until metal pens replaced feathers in writing. Read more about history of quill pens.