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In base 3, three digits (0, 1, 2) are used to represent any given number. In base 2, two digits (0, 1) are used to represent any given number.
Binary means base 2 - it uses two digits. Those digits are zero and one.
Base 10 is based on groupings of 10, and the digits are called 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Base 11 is based on groupings of 11, and the digits are called 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and A. A is used instead of 10 to avoid confusion, because it is a single digit, not two digits that actually have the base 10 value of 11. Notice in 10 base 10, you are using 2 digits, a 1 in the tens place and a 0 in the ones place. In base 11, you only need 1 digits, an A, which has the same effective value.
It's a number system. For example, base 10 means that you have ten digits, 0 1 2 3 4 5 6 7 8 9, before you go to double digits (10). With base 2, you have only two digits, 0 1, before you go to double digits (10).
In decimal we write a number by using a combination of 10 digits (0-9). In base 2, however, numbers are written by using a combination of only 2 digits (0 & 1). We call this number system binary.