The document discusses data storage units and sizes. It notes that 1 byte = 8 bits, and defines kilobytes, megabytes, gigabytes, terabytes, petabytes, exabytes, zettabytes. It states that global IP traffic grew from 15 exabytes per month in 2009 to 64 exabytes per month in 2014, and the number of internet devices will grow from 5 billion in 2010 to 22 billion in 2020. Storage needs are increasing exponentially and one zettabyte is equal to a trillion gigabytes.