The reason behind is not just to innovate and attract more people to use Google, but the main reason is that people type slower than they read, leaving unused time between keystrokes; meaning that while typing there are some dead time that can be used to scan for results.
The benefits that you will get are: Faster Search: With prediction and showing results before finish typing, Google Instant can save you 2-5 seconds per search request. Smarter Prediction: Prediction can help you find what you are looking for, even if you are not certain on what you are searching. Top prediction will be shown in gray, so you can just stop typing and hit enter if you see the prediction is accurate enough. Instant Results: You will get results as soon you start typing. This will feel very familiar, if you ever use the instant search in Windows or Apple OSX Spotlight. Google Instant will make web search faster than ever before, but… is not available for everyone just yet, so if you want to give it a try, follow this link: http://www.google.com/webhp?sclient=psy httpv://www.youtube.com/watch?v=ElubRNRIUg4
Sources About Google Instant & Google Operating System.
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