Application server:

• An application server is a software engine that delivers applications to client computers or devices
• It should handle most, if not all, of the business logic and data access of the application
• benefits of application server:
  1] ease of application development
  2]and centralization
• identified with the Sun Microsystems J2EE platform; however,
• it has also come to encompass servers of web-based applications, such as integrated platforms for e-commerce, content management systems, affiliate management systems and occasionally, even applied to simplistic web-site page builders. The paradigm is more similar to mainframe based applications than traditional client-server.