What is the use of force:showToast in lightning components ?

Hi,

A toast displays a message below the header at the top of a view. The message is specified by the messageattribute.

force:showToast is not available on login pages.

This example displays a toast message "Success! The record has been updated successfully."

showToast : function(component, event, helper) {
var toastEvent = $A.get("e.force:showToast");
toastEvent.setParams({
"title": "Success!",
"message": "The record has been updated successfully."
});
toastEvent.fire();
}