Local v non local hidden variables

[Orange6]

What exactly is the difference between the 2? 

[swansont]

https://en.wikipedia.org/wiki/Principle_of_locality

The concept is that for an action at one point to have an influence at another point, something in the space between those points such as a field must mediate the action. To exert an influence, something, such as a wave or particle, must travel through the space between the two points, carrying the influence.

The special theory of relativity limits the speed at which all such influences can travel to the speed of light, c