what is Factor of Safety distribution?

In solidworks help Factor of Safety distribution is defined as:

To plot the distribution of the factor of safety.

Areas of the FOS plot with values larger than 100 are shown with the color of the 100 value. If the maximum FOS value is less than 100, then the chart is scaled from the minimum to the maximum FOS value.

I dont understand it. What do they exactly mean?

SolidworksSimulation