What are uniform and non-uniform codes?

A code is called uniform (or constant-length code) if all its codewords contain the same number of letters (the same word length). Accordingly, coding is called uniform if the corresponding code has a constant length.
A code is called non-uniform (or variable length code) if its code words have a different number of letters (unequal word length). Accordingly, coding is called non-uniform if the corresponding code is non-uniform.

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