Binary Coded Decimal (BCD) is the number system or code which has the binary numbers or digits to represent a decimal number.

In BCD, we can use the binary number from 0000-1001 only.

Suppose, if a number have single decimal digit then its equivalent BCD will be the respective four binary digits of that decimal number.

From [0 to 9] decimal numbers both binary and BCD is equal but when the decimal number is more than one bit, BCD differs from binary.