The gigabyte (/ˈɡɪɡəbaɪt/ gig-ə-byt or /ˈdʒɪɡəbaɪt/[1]) 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 1000000000bytes. The unit symbol for the gigabyte is GB.
This definition is used in all contexts of science, engineering, business, and many areas of computing. However, historically, the term has also been used in some fields of computer science and information technology to denote the gibibyte, or 1073741824 (10243 or 230) bytes. For instance, the memory standards of JEDEC, a semiconductor trade and engineering society, define memory sizes in this way.