A web server can be referred to as either the hardware (the computer) or the software (the computer application) that helps to deliver content that can be accessed through the Internet.
The most common use of Web servers is to host Web sites but there are other uses like data storage or for running enterprise applications.
The primary function of a web server is to deliver web pages on the request to clients. This means delivery of HTML documents and any additional content that may be included by a document, such as images,styles,sheets and Javascripts.
A client (web browser) initiates communication by making a request for a specific resource using HTTP and the server responds with the content of that resource or an error message if unable to do so.Many generic web servers also support server-side scripting, e.g., Apache HTTP Server and PHP.
An application server is a software framework that provides an environment where applications can run, no matter what the applications are or what they do. It is dedicated to the efficient execution of procedures (programs, routines, scripts) for supporting the construction of applications.
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