The world is full of mysteries. Where was Atlantis? What should you have for dinner? What on earth are Oxford colleges? We might not be able to solve the first two but the third one is actually pretty simple. As an undergraduate student at Oxford University you'll belong to a department like Maths or English, which will oversee your course and house your lectures. But you'll also be part of one of our world-famous colleges. Every undergraduate student who's ever gone to Oxford has been a member of a college. And you'll have one too. Each college is a set of buildings that will be the heart of your personal and academic life at Oxford. Some of them only a few years old. And some are seriously ancient - like from when the Aztecs are around ancient. There are more than 30 of them and they're spread all around the city, although they're all pretty near the centre. They're different colors and shapes and sizes. Some are next to the river, or park, or have a theater. Some have actual deer just casually hanging around. This one's got a graveyard, if that swings it for you. But we get it, too much choice can be overwhelming. Why does it take three hours to pick a film on Netflix? So does it matter which college you go to? And do you have to choose? Well, not really. You can either let us know your preferred college, or if you make an open application, we can find one for you. And once you're here you will no doubt think your own college is the best. She does. Colleges are welcoming and safe communities where you can meet academics and fellow students from hundreds of different subjects. Everything from medicine to music. Plus loads of things that don't start with 'M'. You'll have most of your tutorials in your college and access to lots of support and advice on academic, practical or health matters. You'll be able to get your food there, use the library, wash your laundry, hang out your own common room, sink a pint in your own bar, mess about on boats wearing straw hats. When you arrive you'll be able to live on the site, or right nearby, surrounded by neighbours who'll also be brand new to Oxford. And everyone in college will help you settle in. It'll be like Hogwarts, except without a weird trap door under the sink with a snake in it. It's all pretty relaxed. You're allowed to come and go as you please, or invite friends over. And there are loads of ways to get involved in activities and events outside of college. Sport, drama, role-playing games, and get to know people from all across the university. So colleges are a crucial part of Oxford life, but not something you need to worry about too much. And if you do apply to a specific college, it might not be where you end up. Around a third of students get offer places at one they didn't even apply to. But they still end up thinking theirs is the best.