The concept behind intermittent fasting is fairly straightforward. You switch between periods of non-eating, or “fasting,” and periods where you are allowed to eat, or your “eating window.” Put in simpler terms, your switch between feast and fast mode. When your body is in fast mode (i.e. when you’re sleeping), you're burning fat and all is good in the world. When you're in feast mode (i.e. when you eat breakfast), your body switches gears and begins to break down and process the food you just eat, thus exiting fast mode and the fat-burning process.
By sticking to an Intermittent Fasting regimen, you keep your body in fast mode for significantly longer periods, in turn increasing the amount of fat you burn each day. Want to give it a shot? First things first, do your research and make sure it’s for you (and consult with your doctor). If you decide to run with it, the most common "IF" protocol is eating within an 8 hour window each day, and fasting the rest of the 16 hours. I’ve seen the best results with keeping my eating window from 1pm - 9pm, and working out at 12pm, just before breaking my fast.
Side note: you should still be eating as clean as possible when Intermittent Fasting. Just because you’re fasting for extended periods, doesn’t mean you can eat crap the rest of the time. Schedule a cheat meal each week and save your guilty pleasures for then.