When the user or browser interacts with HTML elements, it is termed an event.
Some examples of events are:
onchange – When elements are changed like the text is changed or inserted into the text field.
onclick – HTML elements like button, image, link are clicked.
onload – Loading a page completed by the browser.
onmouseover – When a user moves the mouse over HTML elements like image or text.
Ajax events are of two types: Local events and Global events
Local events – Acts as callbacks inside Ajax request object
Examples: beforeSend, error, complete, success
Global events – triggered on document and calls listening event handlers
Examples: ajaxSend, ajaxSuccess, ajaxError, ajaxComplete
