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A popup is an individual website window that overlays the primary content, momentarily pausing it to spotlight a specific message. This can range from ads, reminders about items left in a shopping cart, subscription offers, to prompts for file downloads.

Bootstrap Popup is a complimentary toolkit tailored for crafting modern web applications and dynamic websites. This toolkit comprises templates formulated in HTML and CSS, accompanied by JavaScript extensions.

Consequently, with JavaScript, one can design event-driven modal popups, like when the mouse cursor departs from the main content or after a set duration elapses.