SEO stands for search engine optimization, which is a set of practices designed to improve the appearance and positioning of web pages in organic search results.
The short answer is all the copy on your web pages which help you rank. SEO tuned blog content, title tags, image alt-tags, internal links between relevant content.
Off-Page SEO strategies are actions taken away from your website. Things we can do for you where we’re not changing the content on your pages.
Technical SEO can include indexing your website in such a way that it is easier for Google’s web bots to crawl and index your site.