Key to the success of a website is the quality and quantity of traffic to that website. Just building and hosting a nice-looking website will not bring in traffic and users. To obtain good traffic - both in terms of quality and quantity - we need to apply a few steps which drive traffic to our website. All these steps are collectively known as Search Engine Optimization or SEO. SEO targets organic traffic rather than direct traffic or paid traffic. Unpaid traffic can originate from websites, image search, video search, etc.