What is Google Instant ?
recently you might have noticed that as you type any keyword to search for something on Google you are guided by Google through different keywords that people are already using to search for things . This happens on the fly and most of the time you don't need to type the whole term in the search box . This helps you in many ways as many times you don't know exact keywords to search for what you want .
According to Google this saves 2-5 seconds per search and also improves the efficiency of the search results .
Google Instant Preview
Besides instant results you can also get a preview of the website you want to go to before actually visiting it . Google Instant Preview helps you in doing so . To get the preview you will see a lens after the each snippet representing a search result . Click on the lens and you will get the preview .
