A zettabyte is a unit of digital information storage that equals one sextillion bytes, or 1,000,000,000,000,000,000,000 bytes. It is often used to measure large amounts of data, such as the total data generated by the internet or the storage capacity of data centers. To put it in perspective, a zettabyte is equivalent to about one billion terabytes. As technology advances, the amount of data created and stored continues to grow, making zettabytes an increasingly relevant measure in discussions about big data, cloud computing, and data analytics.