The phrase “above the fold” is from the age of newspapers (remember them!) and relates to the content of the paper on a broadsheet which was visible before the page fold (i.e. the top half of the newspaper), where the most important stories and logo etc would be located.
For websites, Above the Fold means essentially the same thing: the visible area of the page which is visible without scrolling.
Amazingly, a lot of people do not “like” scrolling. Data also tells us that buttons and links placed “above the fold” are clicked more often – kind of obvious – and this informs us that we should be selective about what elements are placed “above the fold” in websites.
When we talk about this, in our posts, they’ll be listed below.