If you use a computer or are thinking about buying one, you probably see the term "GB" quite a bit. It is a term used for measuring digital-information storage size.
GB stands for "gigabyte." A gigabyte is 1 billion bytes. A byte is one of the smallest units of measurement of digital-information storage. In some cases (such as in RAM, described below) a gigabyte refers to a larger amount than 1 billion (specifically, 1,073,741,824 bytes).
The term "byte" originally referred to the smallest amount of data that a computer could "bite" or handle at one time. It was spelled byte, with a y, to avoid confusion with another computing term: bit. Giga is a prefix denoting 1 billion.
You will most often need to convert between megabytes (1 million bytes) and gigabytes. There are 1,000 megabytes in 1 gigabyte. Occasionally you may encounter TB (terabyte), which is 1,000 gigabytes.
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Very large files, such as movies, and hard drives are usually measured in gigabytes. For instance, Apple sells its computers with hard-drive capacities ranging from 120 GB to 640 GB.
GB is also used to measure RAM (Random Access Memory). RAM measures a system's ability to multitask, performing several operations at the same time. For the average user, 1 or 2 GB of RAM is sufficient. For a user with greater demands, such as high-end movie editing or animation effects, a system with 3 or 4 GB of RAM may be preferable.