Maybe think about the example Box gave. You might use the same interior door on every doorway throughout a house such as this one:
Screenshot - 3_12_2022 , 6_49_30 PM.png
They all have the same definition which includes the Definition Name of TS6080 TruStile. One has an instance name of Bedroom 1 Door, another Bedroom 2 Door, and a third, Bathrom door.