The Full Form of SEO is Search Engine Optimization. SEO is the process to get 'free' organic traffic and boost your website ranking in search engines like Google, Bing, Yahoo, etc. It is the process to get traffic, views and more visiters to rank higher on Google. SEO tools also used to increase or bring the site on higher position in search engine results. Websites can be improved by making unique content, problem-solving, user friendly and indexed properly, etc.
let's have an example. We search on internet on any topic, we get the first 10 results. The websites that are in the top 10 results are ranked because of proper SEO. The higher the websites you see, the better the SEO they did.
The website that ranked Top on search results, it will automatically get more traffic and more views than other search results. If you want to beat the top one website, you must have to do a good SEO.
Here are some other SEO full form used by people but depend on topic or situation.
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