I agree on the confusion part.
For instance what is the difference between a server application and an application server.
Simple definition I read for
server application is:
"Servers are designed for nearly every purpose imaginable, from email to applications. Every application has specific server requirements, typically designed to run on Windows Server or Small Business Server, Novell Netware, or Linux. Many servers can run multiple applications to serve a variety of needs. As your network grows, you will find uses for a variety of specialized server applications."
http://www.techsoup.org/learningcenter/networks/page4819.cfm
Some examples listed are:
- File and Print Servers
- Mail Servers
- Database Servers