The visible content on a site page is referred to as the 'Page Content'.  The page content is essential for the search engine indexing and ranking of the page and determines whether a page will be returned when a search is initiated.

Web pages must be written for people and not for seach engine spiders or bots. Consequently, it is important to carefully design the page content to ensure (human) readability while at the same time optimizing the content for search engines.