3. SEO Search Engine Optimization SEO is the process of improving the volume or quality of traffic to a web site from search engines via "natural" or un-paid ("organic" or "algorithmic") Search results.(Wikipedia)
8. PPC Pay Per Click PPC is an Internet advertising model used on websites, in which advertisers pay their host only when their ad is clicked. With search engines, advertisers typically bid on keyword phrases relevant to their target market.
11. SMO Social Media Optimization SMO is a set of methods for attracting visitors to website content by promoting and publicizing it through social media. SMO is a subset of socialmedia marketing, which is promoting and publicizing products and services in general through social media.