On-page optimization functions like meta data description, name tag, meta label keywords, keyword density, Web address structure have to be employed patiently and carefully whenever off page functions like article submission, directory submission, social bookmarking, link building should also be applied so as that target web pages should attain desired page ranks in search engine.

what is on/off page optimization and difference between them?

On page optimization really comes down to your keywords. The keyword is really what drives the search engine. Picking of the keyword is absolutely crucial.

what is on/off page optimization and difference between them?