Search Engine Indexing
Search engine ‘crawlers’ examine each page they crawl. Search engines can process many types of content, but not all content types. Content types such as HTML pages and PDF’s can be indexed relatively easily by search engines. Other content types such as images and video are more difficult to index, whereas dynamic content such as Flash, JavaScript, frames or dynamically generated URLs can not always be processed and indexed.
For pages which can be processed, crawlers look at a number of different factors on a page to determine how the page should be indexed. Crawlers extract information such as words from titles and headings as well as their location on the page, along with links to other pages. Information included in key tags and attributes such as ‘meta’ tags and image ‘alt’ attributes are also collected. In a process known as ‘indexing’ all the data about the web page is then stored in a database for use later in a search query.
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