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Insect trapped in resin.

Resin or Rosin (Oxford dictionary) is a hydrocarbon secreted by many plants, especially coniferous trees.

Plants evolved many complex chemicals as defences against herbivores. That may be the origin of these resins, which are certainly not good to eat.

Humans value them for their chemical constituents and uses. They are used in varnishes, adhesives, as raw materials for organic synthesis, or for incense and perfume. Fossilized resins are the source of amber. The term is also used for synthetic substances with similar properties.

Resin of a pine