A gigabyte (GB) is a unit of digital information storage that equals approximately one billion bytes. It is commonly used to measure the size of files, storage devices, and memory in computers and smartphones. For example, a typical smartphone might have storage options ranging from 64 GB to 512 GB, indicating how much data it can hold. In the context of computing, gigabytes are often used to describe the capacity of hard drives, solid-state drives, and RAM. Understanding gigabytes helps users gauge how much data they can store, such as photos, videos, and applications, making it easier to manage their digital content.