The described ENB Files & Preset, read the "ENB Tutorial & Custom Preset Download" article for information.
ENB is a much more resource intensive tool, compared to ReShade, used to inject post-processing enhancements on top of the game. It is not as consistent graphically speaking because ENB has several limitations (where as ReShade is 100% consistent, ENB is roughly 75%), but it will make the game look like a next generational leap above.