One billion () bytes. Unfortunately, the term is sometimes also used to mean bytes. However, this usage is deprecated, and the term gibibyte is preferred for bytes.
Gigabyte
See also
Byte, Gibibyte, Kilobyte, Megabyte, Million, TerabyteExplore with Wolfram|Alpha
References
National Institute of Standards. "Prefixes for Binary Multiples." http://physics.nist.gov/cuu/Units/binary.html.Referenced on Wolfram|Alpha
GigabyteCite this as:
Weisstein, Eric W. "Gigabyte." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Gigabyte.html