Both methods are similar expect for the fact that $(selector).load() is a method, which means it acts on a set  of elements specified by a selector, On the other hand $.get() is global method that has an explicity defined callback function.

The ajaxError() method  will be execute every time there is an error in AJAX request. 
 Example given below:
$("#result").ajaxError(function()
{      
$(this).html("<span>An error occurred.</span>");
})

jQuery.ajax(): Perform an asynchronous HTTP (Ajax) request.jQuery.getScript(): Load a JavaScript file from the server using a GET HTTP request, then execute it.

A JQuery selector is  a function which makes use of expressions to find out matching elements from a DOM based on the given criteria.

Bind():Attach a handler to an event for the elements.Unbind():Remove a previously-attached event handler from the elements.