It depends on who asks the question.
If a primary school child asks me, I tell them that I manage all of the x data. People put it in on their computers or smartphones and I turn it into information. So, when somebody wants to know how many y happened per month last year, I can tell them.
If an adult asks me, I normally just tell them that I'm a DBA for company z and we are in charge of x data. If they express an interest, I go into more detail.