Index server Contains global data for the entire server.
Created by The JavaScript runtime engine on the server automatically creates a single server object to store information common to all JavaScript applications running on the web server. The JavaScript runtime engine on the server creates a server object when the server starts and destroys it when the server stops. Every application on a server shares the same server object. Use the server object to maintain global data for the entire server. Many applications can run on a server simultaneously, and the server object lets them share information.