The terabyte (TB) equals 1,024 gigabytes or approximately 1.1 trillion bytes, used for large-scale storage like hard drives, cloud backups, and enterprise databases. Modern external hard drives commonly offer 1 to 8 TB of capacity, enough to hold hundreds of thousands of photos or thousands of hours of video. One terabyte represents a massive amount of data by everyday consumer standards.

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.