What is the difference if you include a dependency in your pom.xml like
<dependency>
<groupId>group.Id</groupId>
<artifactId>artifact.Id</artifactId>
<type>ejb-client</type>
<scope>runtime</scope>
</dependency>
versus
<dependency>
<groupId>group.Id</groupId>
<artifactId>artifact.Id</artifactId>
<type>ejb</type>
<scope>runtime</scope>
</dependency>
The ejb type refers to a jar file containing the ejb interfaces and implementation, config files, etc.
The ejb-client type refers to a jar file containing just the ejb interface classes. ie. only what is needed by a client of the ejb in order to invoke it.
The maven-ejb-plugin has default or customized in its configuration, that allows for the EJB implementation classes to be excluded from the client.