SEO - Search Engine Optimisation - It is the process of getting traffic from the “free,” “organic,” “editorial” or “natural” search results on search engines.In general, the earlier (or higher ranked on the search results page), and more frequently a site appears in the search results list, the more visitors it will receive from the search engine's users; these visitors can then be converted into customers. SEO may target different kinds of search, including image search, video search, academic search, news search, and industry-specific vertical search engines. SEO differs from local search engine optimisation in that the latter is focused on optimising a business' online presence so that its web pages will be displayed by search engines when a user enters a local search for its products or services
SMO - Social Media Optimisation - The use of a number of outlets and communities to generate publicity to increase the awareness of a product, service brand or event. Types of social media involved include RSS feeds, social news and bookmarking sites, as well as social networking sites, such as Facebook, Twitter, video sharing websites and blogging sites. SMO is similar to search engine optimisation, in that the goal is to generate web traffic and to a site and increase awareness for a website. In general, social media optimisation refers to optimising a website and its content to encourage more users to use and share links to the website across social media and networking sites.
SEM - Search Engine Marketing - Is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results pages (SERPs) primarily through paid advertising. SEM may incorporate search engine optimisation (SEO), which adjusts or rewrites website content and site architecture to achieve a higher ranking in search engine results pages to enhance pay per click (PPC) listings.
SMM - Social Media Marketing - Is a form of Internet marketing that utilises social networking websites as a marketing tool. The goal of SMM is to produce content that users will share with their social network to help a company increase brand exposure and broaden customer reach.