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 petabyte (PB) equals 1,024 terabytes or roughly 1.13 quadrillion bytes, representing storage volumes used by large tech companies, research institutions, and cloud platforms. Major streaming services, social media networks, and scientific datasets are measured in petabytes because of the sheer volume of user-generated content. One petabyte can store approximately 500 billion pages of standard text.