So create a site such as adding text, graphics, scripts a little and not so free And then confronted with the concept of asynchronous programming Why do we? Why not just make a normal page with the price list and such as telephone and icq? Many people do so but not you. The essence of asynchronous programming is that the browser client does not wait until the server processes the request. That is, you press the button clicks on the link and all is well with both conventional computer programs. There are of course various server technologies and they have evolved considerably in recent years. But they face the challenge of simultaneously servicing multiple clients. Imagine a website that 'cooks' coffee for the campaign. There is a Web interface connected to it coffeemakers. One coffee maker, and her office staff queue.