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There is a common perception of Google (and Bing) as being a single mega-computer.
This simply isn't true.
In fact, the major search engines like Google and Bing are made up of a series of hundreds (or thousands) of different computers which all work together to form a large server network - providing users with results for all their search queries.
Keeping all of these computers up-to-date with all of the changes that are happening online is a colossal task, and these thousands of servers are constantly being updated with new information - but it doesn't happen simultaneously.
This means that you can get slightly different results depending on which data center you reached with your query.
The different results can lead to another common question - if you're getting differing results, which data center is correct?
The answer may surprise you: they both are! Each different result comes from the same data source (the search engine), and a user is just as likely to see either result.