SEO Glossary - Letter U
Unique Visitors
The number of visitors who access a website within a given time period (usually 24 hours) from a single IP address. If you visit the same website three times within a 24 hour period, your visits only count as one unique visit for that day.
Universe
It sounds pretty grandiose, but universe refers to the number of potential consumers in a given media or market, which is an important concept when gauging your potential customer base. If, for example, you're trying to sell a product to everyone who has access to email, how many people is that? Depending on who you believe, the universe of Americans online is anywhere from 30 million to 75 million.
Unix
Unix, along with Linux and Windows, is one of the most widely-used and oldest operating systems in the world. Since it operates on every hardware platform imaginable, Unix is used to running just about any type of software application you can think of. Banking applications, Web servers, video games and research stations are just a few possible uses for this diverse OS. Since Unix code was originally distributed freely among universities, government institutions and research laboratories, Unix is considered to be the first open-source operating system. Some open-source permutations of Unix are FreeBSD, OpenBSD, Darwin, and Linux. Some commercial distributions of Unix are SCO, Solaris, and AIX.
Upload
The process of transferring information from your computer to another computer through the Internet. Every time you send e-mail to someone you are uploading it.
URL
Uniform Resource Locator is a means of identifying an exact location on the Internet. For example, http://www.webtrends.com/html/info/default.htm is the URL which defines the use of HTTP to access the Web page Default.htm in the /html/info/ directory on the WebTrends Corporation Web site). As the previous example shows, a URL is comprised of four parts: Protocol Type (HTTP), Machine Name (webtrends.com), Directory Path (/html/info/), and File Name (default.htm).
URL
(Uniform Resource Locator) -- The standard way to give the address of any resource on the Internet that is part of the World Wide Web (WWW). A URL looks like this:
http://www.matisse.net/seminars.html
or telnet://well.sf.ca.us
or news:new.newusers.questions
etc.
The most common way to use a URL is to enter into a WWW browser program, such as Netscape, or Lynx.
See Also: Browser , WWW
Usenet
Refers mostly to the newsgroups, but also to e-mail. Usenet travels on the Internet, but also over modems and satellites.
User Agent
Fields in an extended Web server log file identifying the browser and platform used by a visitor.
User Interface
A computer science term, interface is the point of communication between the computer and any other entity. User Interface, or UI, narrows that definition down to the communication between the computer and a human being. Web designers have taken the sense of this communication of inputs and outputs as a useful way to describe how a user is informed by the design elements on a page. A "good" user interface can mean that the design fulfills a user's expectations. A "bad" user interface gives you few clues about where you are or what you're supposed to do, leaving you with the sensation that you're drowning and don't know which way is up. This condition is known as Web vertigo.
user session
Commonly called a visit. All time spent on a web site (and all activity performed) by an individual user. By industry standard, a user session is terminated when a user is inactive on the site for more than 30 minutes.
username, user-id
An address that designates a personal account on a large computer. For example, mrbill@oh-no.com, where mrbill is the user-id.
UUCP
Unix-to-Unix Copy) Originally, a program that ran under the Unix operating system and allowed one Unix system to send files to another via dial-up phone lines. At present, the term generally is applied to the large international network that uses the UUCP protocol to pass news and electronic mail.
Uuencoding
A common Internet formatting standard for encoding files attached to electronic mail messages. See also MIME, Multipurpose Internet Mail Extensions.
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