Above the fold is the top of the front page of a newspaper or tabloid where important news or photos are often found. Papers are often shown to folded customers so that only the top of the front page is visible. Thus, items that are "above the fold" may be one that the editor feels will attract people to buy paper. Or, it reflects the decision, on the part of the editor, that the article is one of the most important that day. With the extension, the space above the fold is also favored by advertisers, because it's the most prominent and visible even when the newspaper is in the stands.
A 2006 study by Jakob Nielsen found that 77% of web site visitors did not scroll, and therefore only saw parts of websites that were above the fold. There is much controversy about these findings with another extensive research finding 76% of visitors scrolling vertically to a certain extent and 22% of visitors scroll to the bottom of the web page. In a more recent article by Amy Schade and NNgroup it is stated that there is an average difference of 84% in the way users treat content above and below the fold, there is a big decrease in attention below the fold. Most of the web design suggestions available today encourage designers to place important information at the top of websites, but also prioritize usability and design.
Stories of newspapers appearing under the fold are said to be located "under the crease."
Internet search results appear a lot in the same way. Lots of possible website optimization efforts in order to get the highest possible "index search" or "rank" placement for a targeted term or phrase (s). Using natural or "organic" website optimization practices has become standard operating procedure to achieve higher indexing with the end result being the website that appears in the viewing area or "above the fold" of the search results page and especially the first page.
Sections of web pages that can not be viewed without scrolling down.
When Apple was ordered to show thanks that Samsung did not not infringe on their designs, a complaint arose because the Javascript code on its UK web page made a hidden recognition in the "bottom bottom".
Video Above the fold
References
Source of the article : Wikipedia