1. The position, referred to B, or 'bit, bit, the smallest unit of data storage . Each binary digit is a 0 or 1 bit (bit), a communication network used bps, bit per second, bits per second transmission
2. byte, referred to as byte, 1byte = 8b, computer or download speed common Bps, Byte per second, number of bytes per second. It refers to a hard disk capacity bytes.
1byte=8bit
1kb = 1024byte=2^10byte
1mb = 1024kb=2^20byte
1gb = 2014mb=2^30byte
General: related to the transmission speed b generally refers to the bit, b associated with capacity generally refers to the byte.
3. Word, abbreviated word, 1word = 2byte, an English letters and numbers one byte, even byte representing a character.