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SEO Glossary: U

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Unethical SEO
Unethical search engine optimization techniques that are considered unscrupulous and can result in getting sites banned from the search engines. Examples of this include Keyword stuffing, where the site consists of a long list of keywords. Hidden text is when the text on the page is the same color as the background and often consists of lists of keywords that are put there in hope of tricking search engine spiders. Doorway pages that are designed for search engines and spiders in an attempt to trick them into indexing the web site into a higher position. [edit]
Unique visitors
Unique visitors are a count of individual users who have accessed your web site. It should be noted that the "user session" metric does not yield an accurate unique visitor count, as multiple user sessions can be generated by one unique visitor[edit]
The term "universe" in the world of advertising means the total population of the target audience.  [edit]
used interchangeably with web address. Acronym stands for Uniform Resource Locator. URLs can specify the location of a web page, an email address, or a file on an FTP server, among other things. [edit]
URL Rewrite
A technique used to help make web site URLs more user and search engine friendly. [edit]
How user friendly a web site is. The ease of use that a user can perform an action or task through the user interface. [edit]
Bulletin board network featuring thousands of newsgroups. [edit]
User agent
The name of the browser/spider that is currently visiting a page. For example, "Googlebot/2.1 (+" [edit]
User Generated Content
User-generated-content (USG) is content created and published by the end-users online. USG is comprised of videos, podcasts and posts on discussion groups, blogs, wiki's and social media sites. USG allows for a wider content provider base and the chance for all users to share their opinions online. Criticism of USG includes credibility and quality issues.

Submitted by Annemarie Hunter - Netconcepts [edit]
User session
an instance of an Internet user accessing your web site for a length of time, then leaving. During a user session any number of pages may be accessed. A user session is considered finished once an arbitrarily chosen period of inactivity - typically 30 minutes - is exceeded. [edit]