A popup is a small window or message that suddenly appears on a computer or phone screen, often for ads, alerts, or extra options. It can also describe short-term events or stores that appear in a place for a limited time.
From the phrasal verb *pop up*, meaning “to appear suddenly.” It was first used in computing for windows that open automatically, then spread to marketing and events.
The same playful phrase describes both annoying web ads and trendy temporary shops. It shows how English happily recycles a vivid image—something jumping into view—for both digital and real-world surprises.
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