I believe that making the variable constant keeps it the same value all throughout your code.
Yes, just like your opinion, I think the const makes some values unchanged while our program is running
Just one example of a simple use case:
const birthYear = 1975;
var myAge = 47;
var currentYear = 2022;
You see, your age changes, but the year you were born does not.
So…to add to it…you could do something like:
myAge = currentYear - birthYear;
return myAge;
The variable myAge would be assigned the result of currentYear - birthYear.