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.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.