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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. Computer-based devices use the binary system as well this including mobile phones.

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. It takes three binary digits to represent an octal digit. Binary 000 is octal digit 0.
With binary code, you use the binary numbering system to represent text or instructions.

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