What is the role of serialization in EJB (EJB)

Question :What is the role of serialization in EJB? (EJB)
Answer :A big part of EJB is that it is a framework for underlying RMI: remote
method invocation. You're invoking methods remotely from JVM space 'A'
on objects which are in JVM space 'B' -- possibly running on another
machine on the network.
To make this happen, all arguments of each method call must have their
current state plucked out of JVM 'A' memory, flattened into a byte stream
which can be sent over a TCP/IP network connection, and then deserialized
for reincarnation on the other end in JVM 'B' where the actual method call
takes place.
If the method has a return value, it is serialized up for streaming back to
JVM A. Thus the requirement that all EJB methods arguments and return
values must be serializable. The easiest way to do this is to make sure all
your classes implement java.io.Serializable.