Difference between implementing Web Service using Stateless Session Bean and without it

Question

I am trying to learn how to use Web Services. I have been reading this link, but I don't understand the difference between Implement and Not Implement Web Service as a Stateless Session Bean

Answer 1

The @Stateless annotation turns the POJO into an EJB and it gives all the EJB features.

The big difference is that EJBs runs in a full featured Java EE 5+ Web Application Server like GlassFish or JBoss, making it unusable in a Servlet Container like Tomcat or Jetty.

More info:

• Difference between an application server and a servlet container?
• Web Server Vs Servlet Container Vs Application Server