GB stands for Gigabyte, a unit of measurement used to quantify digital information and represents approximately 1 billion bytes. It's important to differentiate between Gigabytes and other units of measure because they represent vastly different quantities of data. For example, a Megabyte (MB) is equal to approximately 1 million bytes, and a Terabyte (TB) represents approximately 1 trillion bytes. Understanding these differences is essential when working with digital storage.