<human>:  What are the differences between SEO and PPC?
<bot>: The main difference between SEO and PPC is that SEO (Search Engine Optimization) is a set of techniques and strategies used to increase the visibility of a website in search engine results, while PPC (Pay-Per-Click) is an online advertising model in which advertisers pay each time a user clicks on one of their ads. SEO techniques can help bring more organic and natural traffic to a website, while PPC campaigns can quickly drive more targeted traffic and are potentially more effective for short term goals. Additionally, SEO strategies require more time and effort to yield results, while PPC advertising is relatively inexpensive and the results can be more immediate.