Transactionsaredynamicentitiesthattraversethroughthenetworksofblocksinasimulation.Theirmeaningisdefinedbythesimulationanalystduringtheprocessofbuildingthemodel.Theyareusuallycreatedtorepresentanactiveobjectsuchanautomobileinatrafficsimulation,anAGVinamanufacturingsimulation,oracustomerinabarbershopsimulation.