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H is for hypertext

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Hyperlinks connect webpages or data items to one another. In HTML, anchor (<a>) elements define hyperlinks from a spot on a webpage (like a text string or image) to another spot on some other webpage (or even on the same page).
Source: Hyperlink
Hypermedia, an extension of the term hypertext, is a nonlinear medium of information that includes graphics, audio, video, plain text and hyperlinks.
Source: Hypermedia
Hypertext is text that contains links to other texts, as opposed to a single linear flow like in a novel.
Source: Hypertext
HyperText Markup Language (HTML)
HTML (HyperText Markup Language) is a descriptive language that specifies webpage structure.
  This is a paragraph of text with
  <strong>some words strongly emphasized</strong>.
Source: HyperText Markup Language
HyperText Transfer Protocol (HTTP)
The HyperText Transfer Protocol (HTTP) is the underlying network protocol that enables transfer of hypermedia documents on the Web, typically between a browser and a server so that humans can read them.
Source: HTTP
HTTP headers let the client and the server pass additional information within an HTTP request or response. An HTTP header consists of its case-insensitive name followed by a colon (:), then by its value. Whitespace before the value is ignored.
Here is an example of HTTP request headers:
Accept: text/html;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.6
And here is an example of HTTP response headers:
Cache-Control: public, max-age=3600
Date: Fri, 27 Oct 2023 05:59:47 GMT
Etag: W/"563c28a59273900c6f7b0cf6a79f0a6b"
Expires: Fri, 27 Oct 2023 06:59:47 GMT
Source: HTTP headers

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