VISUAL BASIC

Detailed explanation-1: -In programming, an event handler is a callback routine that operates asynchronously once an event takes place. It dictates the action that follows the event. The programmer writes a code for this action to take place. An event is an action that takes place when a user interacts with a program.

Detailed explanation-2: -Explanation: An event handler is in general, a function that handles or responds to an event. For example onclick, onkeypress, onload etc are event handler functions.

Detailed explanation-3: -What is Event Handling? Event Handling is the mechanism that controls the event and decides what should happen if an event occurs. This mechanism have the code which is known as event handler that is executed when an event occurs.

Detailed explanation-4: -Answer: Function refers to an event handler.

Detailed explanation-5: -An event listener is a procedure or function in a computer program that waits for an event to occur. Examples of an event are the user clicking or moving the mouse, pressing a key on the keyboard, disk I/O, network activity, or an internal timer or interrupt.

Detailed explanation-6: -The block of code that runs is called a trigger script.