The byte (B) is the standard unit of digital storage consisting of 8 bits, enough to represent a single character like a letter or number. File sizes, memory capacity, and storage devices are all measured in bytes or their multiples, making it the most commonly referenced unit in computing. One byte equals exactly 8 bits and can represent 256 distinct values.

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.