It's a pressfit bottom bracket. (as opposed to the older English threaded BB).

Manufacturers claim that BB30 is stiffer than English but unfortunately, it's also squeakier. You can run cranks for an english threaded BB on BB30 bikes with an adaptor (for example, Shimano doesn't make any BB30 equipment as far as I know, so you may see a bike with all shimano drive train and a FSA crank)

HTH.