A yottabyte is a unit of digital information storage that equals one septillion bytes, or 1,000,000,000,000,000,000,000,000 bytes. It is part of the metric system for measuring data, where each step up represents a thousand times more than the previous unit. For context, a gigabyte is a billion bytes, and a terabyte is a trillion bytes. Yottabytes are used to describe extremely large data sets, such as those generated by cloud computing, big data analytics, and scientific research. As technology advances, the need for storage capacity continues to grow, making yottabytes an increasingly relevant measure in the digital age.