SEO, which stands for Search Engine Optimization, refers to the process of making your site more visible to search engines like Google, Bing, or Yahoo. In a web-based world, having a site of your own is just the first step; the aim is to find that site by others who are looking for similar things on the web.
The main idea of SEO is to use various methods and measures to push the ranking of a website higher in search engine results, preferably on the first page which is the most visited by users. Such a promotion of the site leads to a bigger audience of visitors coming to the site naturally (without paying), thus contributing to the achievement of the set goals of the website.