Google's Personalized Search

Personalized Search is an improvement to Google search that orders your search results based on what’s most relevant to you. The Search History feature of Personalized Search lets you view and manage your history of searches and search results you’ve clicked on; this information then personalizes your future search results by bringing results closer to the top when it’s clear they’re most relevant to you. Early on, you may not notice a huge impact on your search results, but as you build up your search history, your personalized search results will continue to improve.