Google Instant

Google Instant is a predictive search capability that makes search faster by guessing what the users are going to enter as their search query. It’s turned on by default in Google Search, but users can turn it off. (From the main Google search page, click Settings->Search Settings. Choose the radio button, Do Not Use Google
Instant, and click Save Preferences.) Early indications, though, are that most users like it and will leave it turned on.