Application Server
An application server is a mixed framework of software that allows both; the creation of web applications and a server environment to run them. It can often be a complex stack of different computational elements running specific tasks that need to work as one to power the multiple clouds and web-based software and application.
An application server is designed to install, operate and host applications and associated services for end-users. It is commonly paired with a web server or contains a web server which means the two can be converged and named a web application server.