Search Engine Optimization (SEO) is an Internet marketing technique that improves the visibility of a website or a web page on major search engines like Google, Yahoo, Bing, etc. via the natural or un-paid (organic or algorithmic) search results.
Research has established that most customers today are looking for products and services online and not in the Yellow Pages or direct mailers. This means you must be visible to them when they are searching for you! SEO not only puts you on their radar but it improves your chances of converting visitors into customers.
via wsimatrix.com
SEO it's important part of on and off page optimization for any type of business...