POPUPAD
Pop-up ad
Pop-up ads or pop-ups are often forms of online advertising on the World Wide Web intended to attract web traffic or capture email addresses. Pop-ups are generally new web browser windows to display advertisements. The pop-up window containing an advertisement is usually generated by JavaScript using cross-site scripting, sometimes with a secondary payload using Adobe Flash, but can also be generated by other vulnerabilities/security holes in browser security.The above text is a snippet from Wikipedia: Pop-up ad
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