Can you explain what the use of the keyword const means in programming?

In Flutter (Dart), the keyword const is used to declare constant values that are computed at compile time and cannot be changed during runtime. This allows creating immutable objects and improves performance, as such objects can be created once and reused.

For example, if you create a widget with const, Flutter will not recreate it on every UI update, saving resources:

const Text('Hello, world!');

You can also use const to declare constant variables:

const pi = 3.14159;

Thus, const guarantees immutability and code optimization.