What is the main reason of using a javax.activation.DataHandler?

Is it to facilitate the transfer of objects, that do not implement Serializable, over the network?

I.e. for instance I have seen the conversion of files, from local file systems, to bytes and then create a DataHandler with these bytes and transfer the DataHandler over the network.
Is this the reason that one would use DataHandler?

java web-services apache jakarta-ee network-programming
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