It is the set of process in account of which a website or web page is being optimized that helps them to enhance their visibility at top search engine.
On Page SEO and Off Page SEO
On page SEO means optimizing your website and making changes on title, meta tags, site structure, site content, solving canonicalization problem, managing robots.txt etc.
Off Page SEO means optimizing your web presence which involves back-link building and social media promotion.
