Difference between Serializable and Externalizable in Java?

Question

Difference between Serializable and Externalizable in Java?

Answer 1

Akshay Biradar
One of the obvious difference between Serializable and Externalizable is that Serializable is a marker interface i.e. does not contain any method but Externalizableinterface contains two methods writeExternal() and readExternal(). This difference between Serializable and Externalizable is performance.
source:
http://www.java67.com/2012/10/difference-between-serializable-vs-externalizable-interface.html?m=1
I hope I was helpful