All those terms are simply buzzwords, he said. In other words, the differences among them are more perceived than real. Its video and graphics components will be configured for uses way beyond those you are likely to want. If video capabilities are your key concern, spend some time at a computer store, watching video presentations on different machines, then choose the one that does the best job handling the task in which you are interested. If you are a gamer, you have a slightly more difficult task.
Different games work best with different technologies.
Thus, you should choose the machine with the graphics technology that will best suit the specific types of games you like. Again, to make up your mind, ask for demonstrations at the store. Better yet, consult other gamers to see what technologies they favor. The best way to do that is to use Dejanews, the research engine for discussion groups on the Internet. Life used to be simple.