The usual way of fetching the web pages for you suggest a unique way of searching the database for the keywords users have entered. Searching by categories bring a lot of difference as it fetches the necessary the pages in the context of the query.
When a query is passed by the user, search engine assigns a special category to the query. Since the context in which the query has passed by the user is extremely difficult to figure out, search engine optimization techniques are refined to get the best possible search result.
By associating a category to the user typed query, it becomes much easier to identify the context. Search engine maintains a hierarchy of categories to associate user typed query. This preliminary hierarchy of category is pretty general in nature and this category is sub divided into many other categories that directs to the best possible exact context of the user desired search result. Say for example, preliminary category can include sports, entertainment, science etc, and hierarchy of sub categories can accommodate more specific areas like music, football, chemistry etc.
Hence the more refined technique which discussed very recently by experts greatly helps the searchers, writers or publishers to fetch more exact data and prepare categorized articles etc.
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