Natural resins are organic substances produced by certain trees and plants, primarily as a defense mechanism against injury or infection. These sticky, viscous materials can be found in various species, including pine and fir trees. When the plant is damaged, it secretes resin to seal wounds and protect itself from pests and pathogens. Resins have been used by humans for thousands of years in various applications, such as in the production of varnishes, incense, and adhesives. They can also be processed to create essential oils and other valuable products. Natural resins play a significant role in both ecological systems and human industries.