👉 Non-mutability is a property of an object that cannot be changed, even through changes in its state or environment. It refers to the fact that no matter how many times we change the value of an object, it will always remain the same. This means that if you change the value of a variable, it will still have the same effect on the program as before. For example, if you change the value of "a" in the following code: ``` int a = 5