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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 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.