Pop-up forms are interactive windows that appear on a website, usually to capture user information or encourage specific actions. They can be used for various purposes, such as newsletter sign-ups, feedback collection, or promotional offers. These forms typically overlay the main content, drawing attention without navigating away from the current page. Users can easily fill out the pop-up forms, which often include fields for names, email addresses, and other relevant details. While they can enhance user engagement, excessive or poorly timed pop-ups may lead to frustration, so it's important for websites to use them judiciously to maintain a positive user experience.