Why we use search engine optimization?

You use it to make the most our of your website, get it listing in search engine results so that people find your website easily

Search engine optimization (SEO) is the process of improving the visibility of a website or a web page in search engines via the "natural" or un-paid ("organic" or "algorithmic") search results.

Most visitors will find a website by searching for something on Google, right? Google matches up your search term via various algorithms and searches for the sites that best match that term. Of course this is done by robots rather than humans. So, you have to make it easy for the robots to crawl all over your site looking for the search term. Let's say the robot arrives on your site on the home page and you have another 50 pages. If the link from the home page to the other pages doesn't work (bad code etc.) then the robot won't be able to go to those other pages. SEO is just what it says: optimizing a website for its use by the Search Engines. Check your site out on Nibbler for areas that need improvement. http://nibbler.silktide.com/top-sites

Search engine optimization is something that no Internet marketer can do without. Why is this so important? Simply because if your website is search engine optimized, it means that your website is ranking well on the search engines, which in turn means that a lot of people are able to find your website. It is a simple numbers game actually—more traffic means more business. And that’s the reason why marketers just cannot neglect SEO. But, at the same time, it is too much to assume that every marketer out there can spend a large chunk of their time doing things that might enhance their chances on the search engines. Truthfully speaking, the things that most people use—such as blogging, marketing with articles, lead generation, etc.—are dead in the water. These are marketing practices that will work only if you spend a lot of time with them and be quite consistent, which is definitely not going to be possible for the simple reason that if you are going to spend a lot of time optimizing your website, you won’t have any time to manage your business!

of course, you don't want your site at the bottom an not be recognized, that wouldn't benefit you at all. SEO does increase you page rank in search engines by using strategies to boost ratings. james from seoaviator

Search engine optimization is just a phrase for the various things you can do to make your page show up earlier in a Google search. Getting to page 1 on a Google search for a common word or phrase is the most surefire way to vastly increase traffic to your website. If you're stuck on page 20, you'll be lucky if anyone ever clicks it.