A quettabyte (QB) is an extremely large unit of digital data. It equals 1030 bytes, which is a 1 followed by 30 zeros.
To compare, 1 quettabyte is the same as 1,000,000 yottabytes. Today, even the biggest data centers store only a tiny fraction of this amount. A quettabyte is so huge that we mostly use it to imagine the far future of data.
As our world creates more information—from videos and games to sensors and AI—units like the quettabyte help us talk about data on a planet-sized scale.