Thread tag. while receive message from end user using smack

what is this “**95532ef3-af79-4178-b95e-42bd86fd7dde” **, I got below from info from end user while chat with them. Can anybody let me know about this. If u give any some idea and info about it. It’ll be very useful to us. Please help us.

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95532ef3-af79-4178-b95e-42bd86fd7dde