Java Serializable is an interface that enables an object to be converted into a byte stream, which can then be written to a file, sent over a network, or stored in a database. When a class implements the Java Serializable interface, it allows its objects to be serialized and deserialized. Introduced in Java 1995 with Java 1.1, serialization is widely used for persisting object states or sending objects between different parts of a system, such as in distributed applications or web services.

https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html