Computer memory is measured using a hierarchy of units that reflect increasing sizes of data. Here are the most common memory units, from smallest to largest:
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Bit (b) – The smallest unit of data in computing; represents a binary value of 0 or 1.
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Byte (B) – 8 bits. Represents a single character, such as a letter or number.
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Kilobyte (KB) – Approximately 1,024 bytes (2¹⁰ bytes).
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Megabyte (MB) – Approximately 1,024 KB, or 1,048,576 bytes.
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Gigabyte (GB) – Approximately 1,024 MB, or 1,073,741,824 bytes.
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Terabyte (TB) – Approximately 1,024 GB, or 1,099,511,627,776 bytes.
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Petabyte (PB) – Approximately 1,024 TB.
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Exabyte (EB) – Approximately 1,024 PB.
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Zettabyte (ZB) – Approximately 1,024 EB.
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Yottabyte (YB) – Approximately 1,024 ZB.
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