What is the difference between on-site optimization and off-site optimization?

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 optimization means optimizing your web presence which involves backlink building and social media promotion.

SEO is a technique which helps the search engine find and rank your site higher than other million of sites in response to a search query thus SEO helps driving more traffic from Search engine.

SEO has 2 types:

1. On-site SEO: The technique which is used to make a change on the page for the purpose of ranking that page is called "On-site SEO".

2. Off-site SEO: Off-site refers to inbound linking from other website pages to your website pages.