What is SEO?

SEO is an acronym for “search engine optimization“

Which means optimizing your site like the way search engine wants too.
Having  good content, number of quality back links, proper optimization of meta tags,alt text,title text,use of keywords and description,header tag.
Site map,running marketing campaigns will help to pull traffic to your website,and to gain your rank as well.

Optimization of meta tags,HTML tags ,having site map,robot.txt file called on page optimization.
And genrating a back links, link buidling, article posting,forums posting known as a off page optimization.