A pop-up blocker is a type of software that is designed to prevent pop-up windows from appearing on a website or app. Pop-up blockers are typically built into web browsers, and can be enabled or disabled by the user. Pop-up blockers are often used by users to prevent annoying or disruptive pop-up ads from appearing on a website or app, and to improve the overall browsing experience. Pop-up blockers can also be beneficial for advertisers, as they can help to prevent ads from being served to users who have explicitly chosen to block them. Pop-up blockers can also be beneficial for publishers and platforms, as they can help to ensure that their ad inventory is served to users who are interested and engaged with their content.