Online pop-ups are advertisements that appear on a website or application when a user visits the page. They are usually in the form of a small window that appears on the screen and can contain text, images, or videos. The term 'online pop-ups' is often used interchangeably with the term 'ADS, ' which is a three-letter acronym for 'ADVERTISEMENT.' Online pop-ups are typically used by businesses to promote their products or services, and they can be targeted to specific audiences based on their browsing habits.