In the computer, all data are represented as binary digits (bits), and eight binary digits make up one byte. For example, the upper case letter A is 0101001. Numbers however can take several forms. They can retain their decimal identity or they can be in pure binary form. See binary and ASCII chart.
Binary Coded Decimal (BCD)BCD encodes each decimal digit in a single byte. For example, the number 7100 would take four bytes. A variation, called "packed decimal," encodes two decimal digits in one byte, and the number 7100 would take only two bytes.Binary Fixed PointThis method converts the entire decimal number into a binary number. The number 7100 would require at least two bytes as in the example above. Binary numbers are calculated faster than decimal (BCD) numbers. See binary values.Binary Floating PointFloating point allows very small fractions and very large numbers to be maintained and calculated quickly. Both the mantissa (significant digits) and the exponent (power to which the base is raised) are in binary. In this above example, the mantissa is 71, and the exponent is 2. See floating point.Bytes Bits Values 1 8 0 to 255 2 16 0 to 65,535 4 32 0 to 4,294,967,295
Plural form of binary number.
In mathematical terms, binary numbers are represented in base 2, representing numbers as a series of 1s and 0s. Computers work in the binary system because binary numbers can be represented easily in electric circuitry by electrical “on” and “off” states. In the hacker community, the word binary means “not text.” In computing, every 8 binary digits (bits) is used to represent a byte. The full range of 256 values in a byte is not used to convey text, so data that uses only this subset is typically text data.