On-Page helps to Improve your websites title meta.

On page optimization is done to improve the page rank in search engine. It includes the techniques such as
content optimization
Image optimization
Title and meta tag optimization.

on page optimization is a term in seo. where we have to make seo friendly article that we prepare mature starting from the title of the article to the contents of the article.

Onpage helps any website to get ranked, website include many components like page title, meta tags, title tags, sitemap, robot.txt etc.... Do proper on page. Use good contents proper keywords and related descriptions.

On page optimization is one of the very first step of SEO which every webmaster should look into. It probably won’t even take you an hour to learn and implement some of these on-page optimization techniques.

Great explanation..

Is the process of optimizing you website by eliminating HTML errors, decreasing website load time, improving content and meta tags!

On page mean do activities on page like:
use unique content
set keyword
set description
alt tag on images
set title tag
check speed of your site
optimize images, java script, css.