Gigabytes (GB) are a unit of digital information storage commonly used to quantify data size. One gigabyte is equivalent to 1,024 megabytes or approximately one billion bytes. It is often used to measure the capacity of storage devices like hard drives, SSDs, and memory cards, as well as the size of files and data transfers. Gigabytes are an essential measure in computing, reflecting the amount of data that can be stored or processed.