Of course it's possible, pretty much every single laptop out there has had some kind of video out and audio out port to connect to an external display or projector for the last 15 years or so?
Retina MBP's have HDMI built-in, so does the Mac Mini, others can use their thunderbolt through the use of an adapter and HDMI cable.
Not sure if the question is serious or if you've been living under a rock for a few years...