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.

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

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,

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