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The throw statement is used to manually trigger an exception or error in a program. It allows developers to handle different scenarios, by explicitly specifying when an exception should be raised. When an exception is thrown, the normal flow of the program is interrupted, allowing error handling mechanisms (like try-catch blocks) to take over and resolve the issue.

Throw statements are used for handling exceptional cases or errors in programs. They serve as a way to signal that something unexpected has occurred and provide a way to handle it gracefully, rather than have the program crash without explanation. Typically, throw statements are used along with try-catch blocks to handle exceptions.

Let's consider an example to demonstrate the use of throw statement. In this example, we have a function called 'divide' which takes two arguments 'a' and 'b' and returns the result of a divided by b. ```javascript function divide(a, b) { if (b === 0) { throw new Error('Division by zero is not allowed.'); } return a / b; } try { divide(10, 2); // 5 (No exception is thrown) divide(10, 0); // Error: Division by zero is not allowed. (As an exception is thrown) } catch (error) { console.error(error.message); } ``` In this example, when the value of 'b' is 0, an error is thrown with the message 'Division by zero is not allowed.'. The error is caught and handled by a try-catch block, which logs the error message to the console instead of causing the program to crash.