The Cosmic Microwave Background and the Observable Universe

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If you're interested in the Universe you've seen the map of the observable universe. But maybe you don't quite know where it comes from. What dictates it's boundaries? and what do the colors represent?
On top of this you may have heard of cosmic microwave radiation left over from the beginning of the universe. That seems... well kind of impossible. And how is there ALWAYS microwave background radiation?

Even more interesting are the secrets revealed when you start critically analyzing what's happened to this light during its billion years journey to earth.

If you have more questions maybe stick around for the next video... *hint*