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Accessibility is the practice of making websites usable by disabled people – especially blind people.
Google AdSense is a fast and easy way for website publishers of all sizes to display relevant Google ads on their website's content pages and earn money. Because the ads are related to what your visitors are looking for on your site or matched to the characteristics and interests of the visitors your content attracts, you'll finally have a way to both monetize and enhance your content pages.
AdWords takes clickthrough rate into consideration in addition to advertiser's bid to determine the ad's relative position within the paid search results. Google applies such a weighting factor in order to feature those paid search results that more popular and thus presumably more relevant and useful. Google has also started taking into account the quality of the landing page and applying a quality score to the landing pages.
This is the name of the Crawler/spider that is currently visiting a page. Spider is a robot sent out by search engines to catalogue websites on the internet. When a spider indexes a particular website, this is known as 'being spidered'.
An algorithm is an operational programming rule that determine how a search engine indexes content and displays the results to its users.
AllTheWeb is a search engine owned by Yahoo and using its database.
Alt Attribute The ALT attribute is designed to be an alternative text description (provide a text equivalent) for images.
Alt tags alternate text associated with a web page graphic that gets displayed when the Internet user hovers the mouse over the graphic. Alt tags should convey what the graphic is for or about and contain good relevant keywords. Alt tags also make web pages more accessible to the disabled. For example, a vision-impaired user may have a web browser that reads aloud the text and alt tags on a page. (For those familiar with HTML, "alt" isn't actually a tag by itself but an attribute to the "img" tag.). Note that the value of Alt tags for SEO have been discounted over time by the search engines to the point that now it is of minimal value.
Anchor text is the actual text part of a link (usually underlined). Used by search engines as an important ranking factor. Google pays particular attention to the text used in a hyperlink and associates the keywords contained in the anchor text to the page being linked to. Also see "Google bombing."
An ad with movement, often an interactive Java applet or Shockwave or GIF89a file.
API – Application Program Interface
Abbreviation for Application Program Interface. An API is a set of routines, protocols and tools for building software applications; it determines how a service is invoked through the application.