Data immutability is used to signify that a certain value should be treated as a constant and not be changed under any circumstance after it's definition. This can be benefitial to developers in improving readability of code, and prevent a developer from accidentily overiding a constant.

Additionaly, depending on the implementation of interpreter/compiler of a language, using a constant may improve performance, as immediates are faster than loading from memory into a register.
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