This document discusses different types of search engines and how to use them effectively for research. It covers search engines, meta-search engines, and subject directories. For each type, examples are given with the website URL and a brief description. The types include search engines like Google, Sweet Search for students, and Boolify for boolean searches. Meta-search engines discussed are Dogpile, Mamma, and Surfwax that search multiple engines. Subject directories include Yahoo, About, ipl2, Kidsclick, and Eduhound that are created by human editors.