A flash mob is a group of people who gather suddenly in a public place to perform a specific act, often a dance or a song, for a short period before dispersing. These events are usually organized through social media or messaging apps, allowing participants to coordinate without revealing their plans to the public beforehand. Flash mobs can serve various purposes, including entertainment, social commentary, or promoting a cause. They often attract attention and can create a sense of community among participants and spectators. The phenomenon gained popularity in the early 2000s, with many notable examples appearing in cities worldwide.