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Please visit following links:

en.wikipedia.org/wiki/Binary_numeral_system

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Posted by sagitraz

http://www.helpwithpcs.com/courses/binary-numbers.htm

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Posted by Hash007

Binary is the language of digital electronic communication. Binary is another name for Base2 numbering. Our usual numbering system is Base10, in which a single character or column can represent one of 10 values: 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9. The first column indicates how many ones there are in a given value. To represent a value greater than 9, we need another column, which represents how many "tens" there are; if the value we want to represent is greater than 99, we use another column for the "hundreds," and so on. You might notice that each additional column is ten times greater than the preceding one: ones, tens, hundreds, thousands, and so forth—all "Powers of 10": 101, 102, 103, and so on. Base10 is easy because most of us have 10 fingers and have known how to count from an early age.
In binary, or Base2, a single character or column can represent one of only two values: 0 or 1. The next column represents how many "twos" there are; the next column how many "fours," and so on. You'll notice here that the value of each additional column is two times greater than the previous—all "Powers of 2": 21, 22, 23, and so on. This is not a coincidence.
Given that a Base2 or binary column can have only two possible values (0 or 1), this makes it easy to represent a binary value as an electrical value: either off (0) or on (1). Computers use binary because it is easily represented as electrical signals in memory or digital values on storage media. The whole system works because computers are quick at computing arithmetic, and as you'll learn, pretty much all computer operations are really just fast binary math.

Binary Values:
128 64 32 16 8 4 2 1

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Posted by thomas

i agree with crouse
www.helpwithpcs.com

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Posted by waqasahmad

www.helpwithpcs.com/courses/binary-numbers.htm

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Posted by crouse