Search engines gather information by crawling web sites. They crawl from page to page
visiting sites already known and by following the links that they find. Whilst crawling,
the robots, or spiders, gather information from the source code of each site and then send
back that information for indexing. The Spiders were designed to read HTML code or
code related to it such as XHTML or PHP. The Spiders find it difficult to read pages
written in Flash and some other popular web programmes. Spiders cannot directly read
Java Script or images. They can however read the alt tags which may be provided with
GIF, JPEG or PNG images.
visiting sites already known and by following the links that they find. Whilst crawling,
the robots, or spiders, gather information from the source code of each site and then send
back that information for indexing. The Spiders were designed to read HTML code or
code related to it such as XHTML or PHP. The Spiders find it difficult to read pages
written in Flash and some other popular web programmes. Spiders cannot directly read
Java Script or images. They can however read the alt tags which may be provided with
GIF, JPEG or PNG images.
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