Apple use HTTP Live Streaming for their live streams. This is an open technology they are trying to get adopted more widely (RFC: http://tools.ietf.org/html/draft-pantos-http-live-streaming-...). Currently, HLS is not implemented by Chrome or other browsers, in part because Google are pushing a competing standard (http://en.wikipedia.org/wiki/Dynamic_Adaptive_Streaming_over...).
I'm not sure it's clear cut if one is better than the other. I've used HLS and implemented a toy HLS server, and can say anecdotally that it was easy to use and quite a nice standard, although not brilliantly implemented by clients so far. Because of this, I understand why Apple continue to push HLS, and why Google continue to push DASH, and why neither will implement the other's technology in their browsers.