The advantages of SEO (Search Engine Optimization are):
1. It improves your page rank.
2. It improves your Keyword rank.
3. It increases the traffic to your website.
4. It has more flexibility.
5. It increases the sales.

To help you promote your sites.

One good advantage of SEO to a business, is that it gives an EDGE to a client to compete with other competitors.

Whitout SEO your website can't reach top results for specific keywords no matter how good is the domain name.And btw , the domain name should match your keyword phrase or be similar in some ways. In my opinion that's were SEO starts.

Search engine optimization campaign can increase the number of visitors for your website for the targeted keyword(s) or phrase. Converting those visitors into potential customers is one of the arts of search engine optimization. Search engine optimization is the only campaign which can derive targeted traffic through your website. Essentially more targeted traffic equal more sales.
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Thanks to all of you guys for sharing such a very useful information.

Thanks to all of you guys for sharing such a very useful information.