The SEO site description represents your homepage. Search engines show this description in search results for your homepage if they don't find content more relevant to a visitor's search terms.
SEO stands for search engine optimization. What is search engine optimization? It is the process of taking steps to help a website or piece of content rank higher on Google.
Backlinks (also known as “inbound links”, “incoming links” or “one way links”) are links from one website to a page on another website through an anchor text.
SEO - Search engine optimization: the process of making your site better for search engines. Also the job title of a person who does this for a living: We just hired a new SEO to improve our presence on the web.