What is immutability and why should I worry about it?

Question

I\'ve read a couple of articles on immutability but still don\'t follow the concept very well.

I made a thread on here recently which mentioned immutability, but as

Answer 1

An immutable object is something which you can safely assume isn't going to change; it has the important property that everyone using it can assume they're seeing the same value.

Immutability usually also means you can think of the object as being a "value", and that there's no effective difference between identical copies of the object and the object itself.