Explain what is meant by exception in programming and how it is used for error handling

An exception in programming is an event that interrupts the normal execution of a program due to an error or unforeseen situation. In C#, exceptions are used for error handling, allowing the separation of error handling code from the main logical code.

When an exception occurs, it is "thrown" (throw), and the program execution jumps to the nearest exception handling block (catch). This allows for safe responses to errors, such as logging information, notifying the user, or attempting to recover.

Example of usage in C#:

try
{
    int result = 10 / divisor; // may cause division by zero
}
catch (DivideByZeroException ex)
{
    Console.WriteLine("Error: division by zero.");
}
finally
{
    Console.WriteLine("The finally block always executes.");
}

Thus, exceptions help to centrally and structurally handle errors, improving code reliability and readability.