Pine resin is a sticky substance produced by pine trees, primarily as a defense mechanism against insects and diseases. It is composed of various organic compounds, including terpenes and acids, which give it a distinct aroma. When the tree is injured, it secretes resin to seal the wound and protect itself. This natural material has been used for centuries in various applications, such as making turpentine, a solvent, and rosin, used in music for string instruments. Pine resin is also utilized in traditional crafts, waterproofing, and even in some medicinal remedies due to its antibacterial properties.