Byte/baɪt/ Definition 1 of 2Pro Tip 1/3Technical Precision In computing, 'byte' is used for precise data size and storage. That file is exactly 4,000 bytes. Pro Tip 2/3Not Interchangeable 'Byte' and 'bit' are different; a byte is 8 times larger than a bit. High-quality audio is encoded at 320 kbps, but that's kilobits, not kilobytes. Pro Tip 3/3Storage Units Bytes are the building blocks for larger units like KB, MB, GB, TB. My hard drive has a capacity of 1 terabyte.