Here are few paragraph from this book,

This ebook is a hard-hitting guide that gives you the information you need to make the adjustments to your site right away to help improve your search rankings and benefit from the increase in organic search traffic. Search Engine Optimization or SEO is simply the act of manipulating the pages of your website to be easily accessible by search engine spiders so they can be easily spidered and indexed. A spider is a robot that search engines use to check millions of web pages very quickly and sort them by relevance. A page is indexed when it is spidered and deemed appropriate content to be placed in the search engines results for people to click on.

The art and science of understanding how search engines identify pages that are relevant to a query made by a visitor and designing marketing strategies based on this is called search engine optimization. Search engines offer the most cost effective mechanism to acquire “real” and “live” business leads. It is found that in most cases, search engine optimization delivers a better ROI than other forms such as online advertisements, e-mail marketing and newsletters, affiliate and pay per click advertising, and digital campaigns and promotions.