What is a Serializable class?

[coolbiz]

ok so it's just a fancy way of doing things that used to be in place for a long time. So mainly it's another Bell and whistle thing.

It is not just bell and whistle thing, XML serialization is required for transmistting data for WEBSERVICE.

So you serialize your object based on who you want to transmit it to. For example, sending the data to a webservice, you'd use XML but use binary if the endpoint is a .NET remoting service.