Search Engine Optimization, SEO, is the single most effective online marketing tool that you can use to help grow your website business for years to come. If done properly, your website will continue to receive the benefits of higher search engine rankings and your website will continue to get more targeted traffic.
Search Engine Optimization is a form of advertising ... The ONLY kind of advertising that will reap benefits for an extended period of time.
All other kinds of advertising is a 'use-it and it's gone' kind of thing. Most advertisements are, typically, a disposable asset and if you're not advertising effectively, it can be a complete waste of time and money with potentially minimal sales for your marketing efforts.
Organic (natural) traffic is the most desirable kind of traffic that a website can get. It has a higher conversion rate than non-organic traffic since it is highly targeting people who are specifically looking for products or services similar to yours. Search engine optimization services help your website so that it is specifically targeting people who would like to buy your products or services. The targeted people don't generally care who they buy from, they just want the product or service so if you are not in the top of the searches, you may not get that chance to convince them they should buy from you.