Well to answer this question you'll need to know what a search engine is. Well, Google, Yahoo, Bing, these are all big search engines. They help us make sense of the internet and find what we are looking for. So, if you want your website to be searchable, and listed by these search engines, then you need to do search engine optimization. Said another way, it's necessary to do SEO for website so it can get found on Google.
There are actually two different areas you can be found on Google. There is a free section, and a paid section. The free section is the natural or 'organic' section, and this is the section we are talking about when we talk about SEO. The other section is for paid ads called "Adwords" or also known as 'pay-per-click' ads. You can certainly get results from paid ads on Google, especially in the short term, but in the long run, you will definitely see much better results, and save a lot of money if your website is ranked in the organic listings.
Another concept that is important to understand, is that the purpose of SEO is not to get your website found when people search for your business by name, because that should come up automatically. The real power of SEO comes when people find your website who don't know about you yet, but are looking for your products and services. Also, there is no limit to the number of phrases or 'keywords' your website can be found under. In other words, the more SEO you do, the more ways people will find your website, and the more traffic you'll get.
The next thing to understand is that you don't just want to be on Google... but you want to be on the front page of Google. No one really goes beyond page 1 that often. Also, the listings on the top of the page get more clicks than the listings on the bottom. For that to happen your website has to have a good pagerank!
What is pagerank?
PageRank is a term used to establish the degree of popularity of a website and one of the aspects taken into consideration for determining your position in the search engines.
The more a website is clicked through the pages of other websites, the higher your pagerank will get.
So here we offer you a chance to get as much free "back links" as you wish to increase your pagerank!