How do you understand when it is necessary to implement exception handling in code?

Exception handling should be implemented in parts of the code where errors that cannot be predicted or prevented by normal program logic may occur. For example, this includes input-output operations (reading files, working with networks), database operations, type conversions, division by zero, and other situations that could lead to failure.

If there is a possibility that a method may throw an error that needs to be properly handled or communicated to the calling code, it is advisable to use try-catch blocks or declare exceptions in the method signature. This helps make the program more robust and easier to maintain.