Short Wave Infrared.  Electromagnetic radiation with wavelengths roughly 1400-3000 nm, longer than both visible light and infrared energy.  SWIR energy can captured as images by sensors in the same way a photo is captured from natural light by a camera.  The WorldView-3 satellite launched in 2014 is the first commercial satellite with SWIR offerings.  The advantage SWIR offers over other bandwidths is capacity to penetrate haze and smoke, and for distinguishing between different types of minerals.