Types of web applications?

There are two types of web applications,

Presentation-oriented:  

A presentation-oriented web application generates interactive web pages containing various types of mark up language (HTML, XML, and so on) and dynamic content in response to requests. 

Service-oriented:

A service-oriented web application implements the endpoint of a fine-grained web service. Service-oriented Web applications are often invoked by presentation-oriented applications. Presentation-oriented applications are often clients of service-oriented web applications.

Web Services are a technology based on the concept of service oriented computing. Web services are standards that integrate Web-based applications through connecting and sharing business processes across the network where applications of different vendors, languages, and platforms communicate with each other and with clients. Thus applications involve assembling components of Web services. 

Relationship between Web Applications and Web Servers:

A web application can be understood as a collection of files (*.htm, *.asp, *.aspx, image files, XML based file data, etc.) and related components (such as a .NET Code Library or COM Component) stored within a particular set of directories on a given web server.  A web server is a software product in-charge of hosting our web applications, and it typically provides a number of related services such as integrated security, File Transfer Protocol (FTP) support, mail exchange services, and so on. 
Example: IIS 

Internet Information Services (IIS) is Microsoft’s enterprise-level web server software product; it has intrinsic support for classic ASP and as well as ASP.NET web applications. When we build production-ready ASP.NET web applications, we will often need to interact with IIS. Be aware, however, that IIS is not automatically selected as an installation option when we install the Windows operating system (also be aware that all versions of Windows can't support IIS, such as Windows XP/7/8/8.1 Home). Thus, depending on the configuration of our development machine, we may wish to install IIS. To do this, simply access the Add/Remove Program applet from the Control Panel folder and select Add/Remove Windows Components.

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