Resin is a sticky, organic substance produced by many plants, particularly trees. It serves as a protective mechanism against injury and infection, helping to seal wounds and deter pests. Common sources of resin include pine and fir trees, which release it when their bark is damaged. In addition to its natural role, resin is used in various industries. It can be processed into materials for making jewelry, adhesives, and coatings. Synthetic resins, like epoxy and polyester, are also widely used in manufacturing and construction due to their durability and versatility.