This is a medium with single-scattering SSS, and also absorption. To use this medium you need to create a volume, it will not work correctly on simple surfaces.
You can use it to create true unbiased SSS (although not multiple-scattering yet), using various parameters, including scattering texture, emission texture and various other parameters.
Note that this is single-scattering SSS, not multiple-scattering. It’s much faster than the latter and much more practical, although it does not allow a few things such as volumetric caustics.