A measurement of digital information storage or transmission, and a multiple of the unit "byte" using the International System of Units prefix.
Exabytes are 2^60, which is equal to 1,152,921,504,606,846,976 bytes when in relation to computer memory like RAM.
The EB are also 10^18, or 1,000,000,000,000,000,000 bytes when in relation to storage solutions like flash drives or hard drives.
EB are one of the larger measures of byte multiples and are hardly seen outside of large server farms run by large companies and even then hardly seen. Petabytes are more common.
Very similar to Exbibytes, which use a more exact prefix established by the International Electrotechnical Commission.