what is transaction id

I got a dump in st22 . In this dump user and Transaction section it is showing as

Clint : 001

user: A-Rao

Language Key : 'E'.

Transaction ID : "D6F7AADF491FF14280CEF4CE46837424"

Program : "/SAPAPO/SAPLDM_MATERIAL"

I would like to know what is this Transaction ID : "D6F7AADF491FF14280CEF4CE46837424" . with reference we can find the transaction . where we can find please suggest me the solution.