This is a broad question and can be narrowed down by what
hypertext is and why it is useful.
See the related questions of this question for "What is
hypertext?" and "Why is hypertext useful?"
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Hypertext browsing is the act of browsing hypertext or the
interpretation of hypertext as a document -- like a website.
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Hypertext transfers are transfers only consisting of
hypertext.
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A hypertext protocol is a protocol relating to hypertext.
The most well-known hypertext-related protocol would be the
Hypertext Transfer Protocol, which is used to transfer hypertext
from one machine to another.
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Hypertext is combined with HTML as it is formed by it. HTML
could easily create a Hypertext.