# Information theory Archive

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## what is logarithm and its type?

Definition : A logarithm is the result of raising power of a number to which the logarithm is assigned. In other word we can say that logarithm is the power to which the given number is raised.
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## what is prefix free code?

Prefix code or prefix free code is an encoding scheme where no codeword is a prefix of another codeword. Lets see another example Q={011, 110100, 0101 } here none of the codewords is a prefix of any
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## what is code?

In information theory Code is a set of binary strings or  codewords. for example C={1101, 001, 10, 11101} here the set C is a code and the elements of the set are the codewords. C={1101, 001, 10,
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## what is codeword?

A Codeword is the finite arrangement  of binary bits(0,1) which has a specific meaning.  For example 1101 is a codeword. Codewords are used for error-correcting purpose in communication system. C={1101, 001, 10, 11101} C is a set