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A tebibit (Tib) is a unit of digital information equal to 240 bits, which is exactly 1,099,511,627,776 bits. It uses the binary prefix 'tebi-' established by the International Electrotechnical Commission (IEC). The tebibit is closely related to the terabit (Tb), which is defined using the decimal prefix 'tera-' (1012 or 1,000,000,000,000 bits).

The prefix 'tebi-' (representing 240) was defined by the IEC in 1998 along with other binary prefixes (kibi-, mebi-, gibi-, pebi-, etc.). This standardization aimed to eliminate the confusion caused by using SI prefixes (like kilo-, mega-, giga-, tera-) to denote both powers of 1000 (decimal) and powers of 1024 (binary) in computing contexts, which became particularly problematic for larger quantities like terabytes vs. tebibytes. The term 'tebibit' specifically refers to the 240 multiple of bits.

Tebibits are used in contexts dealing with large amounts of data where binary precision is important:

• Specifying the capacity of large memory modules (RAM), solid-state drives (SSDs), or storage systems in technical documentation where sizes are based on powers of 2 at the bit level.
• Calculations in computer architecture, data storage design, and network engineering involving large binary data structures.
• Theoretical calculations in computer science, information theory, and high-speed data transmission analysis.
• Ensuring accuracy when comparing binary (Tib) and decimal (Tb) data quantities, especially in storage capacity planning or analyzing network throughput versus actual data stored. While terabits (Tb) are common for network speeds (Tbps), tebibits provide precision for binary-based storage or memory calculations.