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Binary code uses the digits of 0 and 1 (binary numbers) to represent computer instructions or text. Each instruction or symbol gets a bit string assignment. The strings can correspond to instructions, letters, or symbols. 

This base-2 or binary numeral system is used in mathematics and computer science. The system represents values using just the two symbols. The values in the binary systems are typically called binary numbers.


In digital electronics and more specifically in digital electronic circuits that use logic gates (with values of 0 and 1), computers use the binary system internally.

You can convert to and from binary and the base-10 system typically used by humans. You can also convert to and from binary and hexadecimal where you need four digits of binary to represent one digit of hex. Converting to and from binary and octal is another possibility. 

With binary code you use the binary numbering sytem to represent text or instructions.