The megabyte (MB) equals 1,024 kilobytes or 1,048,576 bytes, commonly used to describe the size of photos, music files, and applications. A typical smartphone photo ranges from 2 to 10 MB, and a single song in MP3 format is roughly 3 to 5 MB. It remains one of the most frequently encountered units when managing personal digital storage.

The gigabyte (GB) equals 1,024 megabytes or roughly 1.07 billion bytes, representing the standard measurement for storage capacity on phones, laptops, and USB drives. A typical HD movie requires 2 to 4 GB of space, and most mobile data plans are measured in gigabytes per month. It bridges the gap between everyday file sizes and large-scale data storage.