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Hallway
A crawl page that only links to doorway pages.
Heading / heading tag
An HTML tag of 6 sizes. H1 being the largest. Heading tags have significance in SEO.
Search engines normally assign more weight to documents where the keywords used in the query are found inside heading tags. Pages that
use heading tags generally rank higher, but excessive use might get the page de-listed.
Hierarchical clustering
Clusters or groups (of search results) organized into a hierarchy or tree structure instead of a flat list of clusters/groups.
Hidden text
Text on a web page designed to be visible to spiders but not to human visitors. The aim is to load the page with keywords without
deterring from the visitor's experience. Of the various techniques of hiding text, the most common is to set the text color to exactly
or nearly the background color. Most search engines can now detect hidden text and consider it a form of spamdexing. Pages that contain
hidden text are penalized or even de-listed.
Hits
This generally means all requests from a webserver including requests by a web browser for html pages, jpeg's, gif's and other images.
Hits is a phrase often thrown around but is generally not very meaningful in quantitfying search engine traffic.
Hit-and-run page
A page that gets many hits (traffic) and quickly disappears again.
Hot linking
The practice of displaying images files, video files etc. on a web site when those files are on another
(usually someone else's) server. Effectively the site displays content that uses up someone else's bandwidth. Hot linking is generally
considered unethical unless prior permission is obtained.
Hub
Coined by Jon Kleinberg during the development of his HITS algorithm. Hubs are sites that link to many other sites that are cosidered authorities in their topic area.
Hyperlink / link
Clickable content on a web page usually leads to another page, another site or another part of the same page. The clickable content therefore is said to link to the other page / site / part of the same page.
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