A distributed system is one in which the failure of a computer you didn’t even know existed can render your own computer unusable.
A trivial example application of AJAX is a running stock ticker. Every
30 seconds, whether you click anything or not, it updates the current stock
price on a part of your web page. Another example is an events calendar that
reacts to the mouse hovering over a date, rather than clicking the date. As
the mouse moves over a date (the