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 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.