A flash sale is a promotional event where products or services are offered at significantly reduced prices for a very short period, often just a few hours or a day. These sales create a sense of urgency, encouraging customers to make quick purchasing decisions to take advantage of the limited-time offers. Retailers, both online and in physical stores, often use flash sales to boost sales, clear out inventory, or attract new customers. Popular platforms like Amazon and Groupon frequently host flash sales, making them a common strategy in the competitive retail market.