This document provides an overview of search engines and tips for using Google search more effectively. It defines what a search engine is and lists the top search engines in the US, with Google receiving over 1.6 billion monthly visitors. The document then gives various statistics about Google's massive search volume. The remainder of the document provides helpful hints for refining searches, such as using quotation marks for exact phrases, operators like "site:" and "filetype:", and tips for searching for specific types of information like weather, stock prices, and product identifiers.