The bit is the most fundamental unit of digital information, representing a single binary value of either 0 or 1. Every piece of data stored or transmitted across the internet ultimately consists of bits, from a single text character to high-definition video streams. Eight bits make up one byte, which is why data storage is typically discussed in bytes rather than bits.

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.