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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 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.