SEO Glossary - Letter V
Validation
Validation is a way to make sure that your code is compliant with the current HTML specifications. This means you can check to make sure that you didn't accidentally use proprietary tags that would only work on your particular browser. There are many HTML validation sites on the Web, such as Bobby, which will analyze single Web pages for their accessibility to people with disabilities, Weblint, one of the first validators, and the World Wide Web Consortium's rigorous validator, which provides validation for HTML 4.0.
Vector
Vector graphics produce images using mathematically generated points, lines and shapes that are rendered on a computer. The result is a file much smaller than a bitmap, which is easier to send and download over tight bandwidth connections. In addition, a vector file can be resized and manipulated without distorting the image. Macromedia’s Flash produces vector graphics, and most browsers now support vector graphics.
Virus
Your computer can get a virus just like your body can be invaded with a virus making you (or your computer) sick. A virus can wipe out information on your computer and create major havoc. Viruses usually originate from malicious people. You can unintentionally download virus from a web site or get it from a disk that someone has lent you. There are virus-checking programs, but there are new viruses popping up every day. So the best defense against a virus is to be very careful not to download programs or data from a site you're not familiar with.
Visit
Commonly called Visitor Session. All activity for one visitor of a web site. By default, a visitor session is terminated when a visitor is inactive for more than 30 minutes.
Visit
At first glance, a visit seems pretty straightforward: it begins when a visitor comes to a Web site and ends when they leave. But try to measure a visit and things get a little tricky. For example, if a visitor reads an article on your site, follows a related link to another site, then returns to your site afterward, should that count as one visit or two? Or suppose someone comes to your Web page and then starts working on something else, leaving their browser open in the background. If they click back to your site eight hours later, should that be considered a separate visit, or just one mighty long stay? According to the Media Measurement Task Force at the Internet Advertising Bureau (IAB), a visit is "a series of page requests by a visitor without 30 minutes of inactivity" - which just goes to show how arbitrary the measurement of a visit can be.
Visitor
You'd think that figuring out how many unique individuals visit a Web site in a given time period would be pretty easy, but in reality it's not. Web site developers have few ways of determining exactly how many people use a given computer, IP address, or ISP account. In fact, beyond the data you get from registration processes and cookies, there's very little reliable information on how many people visit a site, which makes hard numbers hard to come by.
Visitor Session
A session of activity (all hits) for one visitor of a web site. A unique visitor is determined by the IP address or cookie. By default, a visitor session is terminated when a visitor is inactive for more than 30 minutes. This duration can be changed from General panel in the Options, Web Traffic Analysis dialog. Synonym: Visit.
VPN
(Virtual Private Network) -- Usually refers to a network in which some of the parts are connected using the public Internet, but the data sent across the Internet is encrypted, so the entire network is "virtually" private.
A typical example would be a company network where there are two offices in different cities. Using the Internet the two offices mereg their networks into one network, but encrypt traffic that uses the Internet link.
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