What is binary number?

ohwo What is binary number? It is a number expressed in the base-2 numeral system or binary numeral system.
I have an example, how to transfer 63 into binary number? we
63/2 = 31 --------1
31/2 = 15 --------1
15/2 = 7 ---------1
7/2 = 3 -----------1
3/2 = 1 -----------1
1/2 = 0 -----------1

and we just write the residuals 1 from bottom to to. We have the answer 111111.

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