What is seo? |Search engine optimization | who it works? |what is seo in English

Search engine optimization (SEO) is the practice of increasing the quantity and quality of traffic to your website through organic search engine results.
Seo divided into onsite seo and offsite seo.
Onsite seo consist keyword,keyword research, keyword density, meta tag etc.
Off-site set consists baclink, link building, domain popularity etc.