Many browsers now include pop-up software to keep pop-ups from launching. To activate your browser’s pop-up blocking software, visit the Browser Settings page and follow the instructions for your browser.
Some pop-ups are useful, such as context-sensitive help windows that can assist you when you are filling out an online form. If you have pop-ups blocked, your browser will display a message at the top of the main window that shows a pop-up has been blocked. If you want to view that pop-up, you can click a button to allow that specific pop-up to display. Visit the Browser Settings page for more information.
Pop-ups are a form of online advertising used to attract web traffic or capture email addresses. Pop-ups are web browser windows that open on top of the active browser window, often used to display advertisements, special offers, or other ancillary information.
Pop-unders are a variation on the pop-up window, typically an advertisement, which opens a new browser window that is hidden under the active window. Pop-unders do not interrupt the user immediately and are not seen until the active window is closed, but this makes it more difficult to determine which web site opened them.