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What Is Bit?

The bit is the basic unit of information in digital communication. It is represented by the numbers 1 and 0. The name is derived from binary digits. A bit can be stored in a digital device or physical device that can exist in two possible distinct states. 8 bits form a byte. Half a byte is called a nibble. 1024 bytes form 1 kilobyte. 1024 Kilobytes form 1 Megabyte and so on.

Decimal Binary
0 0
1 1
2 10
3 11
4 100
5 101

What is Binary Coded Decimal (BCD)?

BCD is a type of binary encoding where each decimal digit is represented by a fixed number of bits. Each decimal is represented by its corresponding binary number as in the case below. Characters are represented by a special set of patterns.

Decimal: 9 8
Binary 1001 1000

Thus 98 becomes 1001100 in BCD.