The gigabyte is a multiple of the unit byte for digital information. The prefix giga means 109 in the International System of Units. 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, including hard drive, solid state drive, and tape capacities, as well as data transmission speeds. However, the term is also used in some fields of computer science and informatio