Percolation resiliency refers to the role network density plays within the resilience of a system. Percolation refers to the density of connections through which some phenomena can spread within an area or group of people. A good example of this is research done on forest fires in California, which has shown that if the forest receives less disturbances, i.e. if we reduce the number of small frequent fires, then the density of trees within the ecosystem builds up, it becomes more tightly coupled, as the percolation increases, this creates more pathways for the fire to spread from tree to tree. As this percolation becomes more dense the system reaches a point from where any small fire can now spread through the whole forest, creating a large systemic effect and this is what we call criticality, the system has reached a critical point.