Serializable and the significance of serialVersionUID.

Serializable is a marker interface that tells the JVM that an object can be converted into a bitstream.

serialVersionUID:

• A unique ID used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible.
• If the receiver has loaded a class for the object that has a different serialVersionUID than the sender, then deserialization will result in an InvalidClassException.
• Best Practice: Always define a static final long serialVersionUID to ensure cross-version compatibility.