At its most simplest, it is a technology that theoretically allows for fuel-less engines within the depths of space that can significantly enhance space travel. Theoretically, it means that instead of taking 6 months to reach Mars, it can arrive within a week. The technology allows for a vehicles speed to increase again and again up to an nth amount, meaning it can reach speeds much greater than any other object invented. Until recently it was thought that this technology was impossible, until last year when it was reported that it may have merit after all. NASA launched their own investigation and has concluded that show force measurements while the device is in a hard vacuum. http://nextbigfuture.com/2015/02/more-emdrive-experiment-information.html?m=1 There was a lot of articles on it last year, I'm not really in the most opportune of situations to post them all at the moment, unfortunately.