Is EJB is a application server or web server?

Question

how do i differentiate the use of glassfish and EJB?

Answer 1

EJB is a server-sidesoftware component that encapsulates business logic of an application. An EJB web container provides a runtime environment for web related software components.

GlassFish  is the reference implementation for a Java EE application server, which includes such technologies as Servlets, EJBs, JPA, JSF, JMS and comes bundled by default with the Java EE SDK download from Oracle.