Mobile application development is the set of processes and procedures involved in writing software for small, wireless computing devices. Like Web application development, mobile application development has its roots in more traditional software development. One critical difference, however, is that Mobile apps are often written specifically to take advantage of the unique features a particular mobile device offers. For instance, a gaming app might be written to take advantage of the iPhone's accelerometer or a mobile health app might be written to take advantage of a smartwatch's temperature sensor. Quality of traffic: You can attract all the visitors in the world, but if they're coming to your site because Google tells them you're a resource for Apple computers when really you're a farmer selling apples, that is not quality traffic. Instead you want to attract visitors who are genuinely interested in products that you offer.
Quantity of traffic: Once you have the right people clicking through from those search engine results pages (SERPs), more traffic is better.
Organic results: Ads make up a significant portion of many SERPs. Organic traffic is any traffic that you don't have to pay for.