What is a Search Engine?A search engine is an online database of websites that allows Internet users to search for information contained on websites contained in the database by "Keywords".Keywords are words that Internet searches are likely to use when looking for information on a specific topic. For example, the words "grad schools" would likely be used when looking for information on continuing post-secondary education.Each search engine has slightly different behaviors and characteristics. What is a Directory?A directory is a search tool much like a search engine but with a few major differences. Directories tend to employ human editors to review and rank websites submitted to their database. Yahoo! is the most well known example of a directory. Most directories catalog websites based...