Question

What is the difference between Google and a subject directory like Yahoo Directory or Infomine?

Answer 1

Google is a fairly large internet service where several different types of information can be found. Google is helpful when researching broad topics, you don't know too much about. Yahoo Directory and Infomine are more narrow means of researching. They are best used for providing specific information.

Answer 2

Google is a search engine that finds information that is related to the specific topic of what you are searching.
Subject directory is a classified web pages in an organized set of categories.