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Binary code is the common name for a code, that is used to encode a message by sequences of two different symbols (e.g. 0 and 1).
Binary codes are very important especially for digital information technology.
The dual code is mostly used for numbers. This code encodes integer numbers in the dual system. Negative numbers are usually encoded in two's complement.
Another simple binary code is the BCD code, that encodes number 0 to 9 with four bits. Floating point numbers are encoded in a mixed code (see IEEE 754) different to integer numbers. Text is encoded with ASCII or Unicode char by char as numbers, which afterwards are encoded binary.