How does Google find results so quickly?

google-underground-map

When you enter a search in Google, you aren’t actually searching the web, you are searching Google’s index. This is compiled and continuously updated by automatic programs, called ‘spiders’, that follow links from page to page to travel across the web. The information they collect – along with snapshots of the pages themselves – is stored in the index. The index is much smaller than the web and the index entries are all stored together so it is much quicker to look through it than hopping from one computer to the next across the internet. Also the index is sorted and organised to make searching faster.

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One Response to How does Google find results so quickly?

  1. Steve B says:

    A good concise description of web searching. Your description does not only cover Google (>80% of the search market), but the also rans, i.e. Yahoo, Bing, Ask, etc.

    The search paradigm can be summarised as being:
    Crawl, Index, and Search.

    One thing that is unique to Google’s search approach is that it also ranks an individual page’s importance according to how may back links it has. This means that relevant sites rise to the top of the search results given to the user. Which explains why it has the market share it has.

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