Search Engine Optimization (SEO) is used in all aspects of web marketing. You need to understand as much as you can about how SEO works in order to get the proper marketing of your website online.
When you use SEO in all of your content - both text and visual, you can draw more traffic to your site. In order to understand how to use SEO, you need to know why people use this type of marketing and rely on it so heavily in order to get the desired traffic to their website. SEO is what gets a website noticed in the search engines.