The University of Oxford is a school where lots of smart people go to learn more about all sorts of topics. It's in a place called Oxford, which is in England.
People have been studying at Oxford for a really, really long time- over 900 years! That's longer than most people's great-great-great-great-great-great-great grandparents have been alive.
There are lots of different subjects that you can study at Oxford, like math, science, history, and even things like music and art. Some of the most famous people in the world have gone to Oxford to learn, like Stephen Hawking and J.R.R. Tolkien.
In order to go to Oxford, you have to be really smart and work really hard. You have to study lots and lots and lots, and take lots of tests to show that you know what you're talking about. But if you manage to do it, you'll be able to say that you're one of the smartest people in the world, too!