The main difference between SEO and PPC is that traffic coming from search engine optimisation work – and therefore appearing ‘organically’ in Google rankings – is free, with traffic coming from pay per click (PPC) being paid for. Adwords (the ‘PPC’ advertisements listed Google search pages) are almost certainly always going to be shown before organic listings in search engine results pages (SERPs), because paid search ads are how Google makes much of its revenue. Improving search engine optimisation features on your site can result in search traffic that costs nothing to receive, so if you have no budget for paid search, than SEO is perhaps the main way you will receive web visitors. If you use PPC, put simply, you effectively bid against other advertisers to appear in various positions – and in various frequencies – above organic Google listings when users type in searches and receive results pages.