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Orders of magnitude of data. The yottabyte is a multiple of the unit byte for digital information. The prefix yotta indicates multiplication by the eighth power of 1000 or 1024 in the International System of Units (SI), and therefore one yottabyte is one septillion (one long scale quadrillion) bytes. The unit symbol for the yottabyte is YB.
A KB (kilobyte) is 1000 bytes, an MB (megabyte) is 1000 kilobytes, a GB (gigabyte) is 1000 megabytes, a TB (terabyte) is 1000 gigabytes, you get the pattern. After terabyte is petabyte, pettabyte is exabyte, exabyte is zettabyte and zettabyte is yottabyte. That's the last prefix we have right now.