What does the keyword final do? It's necessary to declare a variable. Enables the use of printin on a variable. It prevents variables from being altered. It indicates that the program has finished executing.

## Step 1<br />The keyword 'final' in programming languages such as Java is used to declare a variable that cannot be altered once it has been initialized. This means that once a value has been assigned to a final variable, it cannot be changed.<br /><br />## Step 2<br />The keyword 'final' does not enable the use of printing on a variable. Printing a variable is a separate operation that is not directly related to the 'final' keyword.<br /><br />## Step 3<br />The keyword 'final' does not indicate that the program has finished executing. The execution of a program is determined by the flow of the program's logic, not by the 'final' keyword.