I apologize for misspelled words in my previous response.

A basic example of mutable code in c++
```cpp
#include <iostream>

int main()
{
    int a = 5;
    std::cout << a; // 5
    a++;
    std::cout << a; // 6
    return 0;
}
```
And immutable code example
```cpp
#include <iostream>

int main()
{
    const int a = 5;
    std::cout << a; // 5
    a++;
    std::cout << a; // 5
    return 0;
}
```

As you can see in the first example a is allocated and then the memory is accessed on the `a++` line to increase the value by 1 but in the second example since the integer was declared using `const` the memory that is allocated to a is protected from changes. Data immutability feature can be found in most programming languages and can be used to protect functions, classes variables and other data from changing.
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