A pop-up is a temporary and unexpected appearance or occurrence, often in the form of a window or message, that interrupts the current activity or content on a computer screen or mobile device. This can include advertisements, notifications, or prompts that require the user’s attention or action. Pop-ups can be both helpful and annoying, as they can provide important information or be used for marketing purposes. However, they can also be used maliciously to deceive or trick users. The term ‘pop-up’ can also refer to a temporary event or shop that appears in a specific location for a limited time, offering unique products or experiences.