What are real life application of data structure?

In real life the importance of data structure is much more bcoz it providing a disconnected transaction between database & workstation

just take a example that when some one going to on line shopping at that time at first he/she wants to select the items to purchase simultaneously if the person donot want some selected items then he/she can also retrieve from the list,these all are done in data structure when you at last enter the submit button at that time this will retrieve from the database & enters in to sales list.

Means these all transaction are done in data structure there is no need to transect with data base by that transaction will be faster,secure,good performance,efficient etc