Event Handler: The function or lines of code that do something upon an event fire are known as event handlers. For example: click is an event that is fired when something is clicked. onclick is an event handler that does something when the click event occurs.
Events are essentially generic messages that are sent to objects from the system or from SCL applications. These messages usually direct an object to perform some action such as running a method. Event handlers are methods that listen for these messages and respond to the them.
Is event handler a function?
Imagine an onclick event in html, it will call a function, that function is the handler. Handlers are functions that are called in response to some sort of actions/events whereas, a function is what we call from our code. In most cases, a handler receives an argument describing what sort of event fired it.
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.
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