If someone casually asks what I do for a living, or I'm filling out an application for a car loan or something, then I simply reply that I work in "Information Technology". Most people have at least a vague idea of what IT people do, just like they vaguely know what a doctor or accountant does.
The other day my young kids asked what I do at work, and if I'm the boss. I told them that I'm the boss of a bunch of really big computers: I tell the computers what to do, keep an eye on them to make sure they're working, and fix them when they're broken. I'll revise the story with more detail as they get older.
"The universe is complicated and for the most part beyond your control, but your life is only as complicated as you choose it to be."