Do you know what is the website's fold?

Hello Friends,

Recently I heard this word website's fold and when I searched about it I found that fold is a term used by web designers to describe a bottom border of a web browser window. And there are two types of website's fold:

Above the fold - Indicates to the content that is noticeable above the web browser window border, when the webpage load first.
Below the fold - Indicates to the part of the page that needs scrolling to see the content.


If you guys know more about website's fold, please let me know in the comments.