Big data refers to the massive amounts of data being generated from various sources that can be analyzed to reveal patterns and trends. It encompasses the volume, velocity, variety, and veracity of data. Examples include social media posts, photos, videos, sensor data from devices and machines. Big data is growing exponentially and being generated more quickly. While it provides opportunities to improve operations and decision making, it also poses challenges around privacy, security, and managing such large, complex datasets. Real-world examples demonstrate how companies are leveraging big data to boost sales, optimize processes, and enhance customer service.