Do you mean off page and on page? Off page is link building and reputation management On page is titles, headers and keyword density. (in a nutshell) Offline SEO is an impossibility, you need to be online to access a search engine. I suppose you could use the term to mean 'above the line' advertising - newspapers, TV, billboards etc, but that's not SEO - it has no direct bearing on how a search engine sees your site