Google instant is a new search enhancement that shows results as you type. They are pushing the limits of our technology and infrastructure to help you get better search results, faster.
This feature did not much affect the ranking but may affect the user views and targets.Because Google suggest keywords which were frequently being used.that may affect the user behaviors.
Google Instant helps users find information faster by showing relevant results as a query is typed. As users get this immediate feedback, they're able to refine their searches more quickly and find the results that more precisely match what they need. As a result, we expect increased user engagement with our search services, including ads.
When you type some words in Google search engine text box then their some related words come on drop down its call Google instant. You can turn off Google Instance from your personal setting.
It is helpful when any search in Google search engine it is save your time and guide for the proper search
Google instant is something in which where you type a single word it will show the results matching that word. It has no negative effect it's just a feature of google.