Leon Gray 
What Is a Search Engine and How Do I Use It? [PDF ebook] 

This handy guide to search engines allows readers to learn the tricks to using these Internet-indexing services to their maximum potential. With an informative history of the development of search engines, this book teaches readers how this essential tool for the Web has advanced in its technology for categorizing websites and then pulling them up for users at the click of a search button. From an electronic "spider" that crawls the World Wide Web looking for new web pages to the meta tags and hash codes that have come to help optimize results, this book covers the early days of Yahoo and Web Crawler through the most recent developments in search engine technology. A discussion of Cloud computing and other safety issues makes this a key read for anybody who wants to stay up on today’s issues in Internet security.