Differentiate between the web server and application server?

Web Server is the connection between the HTTP and HTML. Web server takes the response from the client browser and gives output in the form of HTML. It is understandable of HTTP and works on HTTP protocol.

Apache Web server is a good example of the web server. There are several containers that are used to accomplish servlets. JSPs is also referred to as servlet container, for e.g. Tomcat.

While there is some list of supplementary features that are provided by the Application Servers. This list includes

Enterprise JavaBeans support

JMS Messaging support

Transaction Management

So, Applications server are basically the modified version of web servers which includes some additional features and functionalities that make the developers more comfort with business applications.