The original definition of “above the fold” related to the upper-half of the front page of your daily newspaper. Important “newsworthy” articles were reserved for this portion of the paper because they were featured front and center.
Today, the phrase remains true for newspapers, but it has been repurposed for websites. “Above the fold” refers to webpage content that is visible without scrolling. There is a stipulation. If your monitor is high resolution and your browser is expanded to fit that resolution, then you will see more content “above the fold” than someone who has a low-resolution monitor.
The example above is clixfuel.com above the fold.