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SEO -Search engine optimization (SEO) is the process of improving the visibility of a website or a web page in a search engine's "natural" or un-paid ("organic" or "algorithmic") search results.
SMO- SMO (Social Media Optimisation) is the process of preparing a website for use by social media communities. This process includes places social bookmarking buttons on pages, embedding social media tools on pages and developing content specifically targeted at social media communities.
SEM - MM (Social Media Marketing) is the process of entering into social media networks with a strategic plan to enhance your SEO. SMM seeks to increase your visibility within social networking communities by generating links, posts and articles etc with the purpose of driving traffic, increasing popularity and increasing brand awareness.