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The gigabyte (/ˈɡɪɡəbaɪt/ GIG-ə-byt or /ˈdʒɪɡəbaɪt/) is a multiple of the unit byte for digital information. The prefix giga means 109 in the International System of Units (SI). Therefore, one gigabyte is 1 000 000 000 bytes. The unit symbol for the gigabyte is GB.
The exabyte is a multiple of the unit byte for digital information. In the International System of Units (SI), the prefix exa indicates multiplication by the sixth power of 1000 (1018). Therefore, one exabyte is one quintillion bytes (short scale). The symbol for the exabyte is EB.