Off site SEO includes things like link building and social interaction. Website credibility issues like public relations and branding also play a big roll in off site optimization.
Off page SEO refers to techniques that can be used to improve the position of a web site in the search engine results page (SERPs). Onsite SEO involves making sure your website pages, titles, tags, content and overall structure are optimized for your target keywords. You also need to make sure that you have a significant of inbound links from highly respected external websites - that's called offsite SEO
Off page SEO refers to techniques that can be used to improve the position of a web site in the search engine results page (SERPs). Many people associate off-page SEO with link building but it is not only that. In general, off Page SEO has to do with promotion methods – beyond website design –for the purpose of ranking a website higher in the search results.