The "Wood Wide Web" refers to the underground network of mycorrhizal fungi that connects the roots of trees and plants in a forest. This network allows for the exchange of nutrients, water, and chemical signals between different species, promoting cooperation and communication among plants. Through this system, trees can share resources with neighboring plants, helping weaker or younger ones survive. The Wood Wide Web also plays a crucial role in forest health, as it enables trees to warn each other about pests or diseases, enhancing the resilience of the entire ecosystem.