It is a procedure for converting numerical data stored in information technology (electronic or optical) media to the decimal form that people are accustomed to using.
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10
110001.01
15 = 1111
If you use Windows, you can use the Windows calculator to convert from decimal to binary. Change to scientific mode, be sure the calculator is in decimal, type the decimal number, and switch to binary. If you are practicing decimal to binary conversion, this is a great tool to verify that you have done your calculations correctly.
"Ordinary" numbers are on base 10 (="decimal"). Binary only has 2 digits. 0 and 1 (representing "on" or "off" in some circuits). So "conversion" is how to represent an number in one to how it appears in the other. So 10 (binary) means 1x21 + 0x20 , which is 2. Decimal to binary effectively means representing an ordinary ("decimal") number in binary form. So 10 (decimal) is broken up into powers of 2 as 8+2 = 1x23 + 0x22 + 1x21 + 0x20 which is 1010 (binary).