Search engine optimization is a process to improve their site with both users and search engines in order to increase the website traffic receives from Organic search.
It will make easier for search engines to crawl the website and understand the content and to index the web pages (i.e most relevant keywords searched) and improve ranking. SEO makes the site search engine friendly when it comes to visibility in search engines, so that customer cans can find the site very easily when they surf on the web. It is also called as Natural or organic search results, no need to pay for search engine to get listed on the search engine database.