The most popular language on earth isn’t spoken, it’s smelled. Those smells are made up of terpenes, a multipurpose class of chemical compounds.

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Sources:
https://www.britannica.com/science/terpene
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Images:
https://en.wikipedia.org/wiki/Isoprene#/media/File:Isoprene-Structure.png
https://en.wikipedia.org/wiki/Manduca_sexta#/media/File:Tobacco_Hornworm_1.jpg
https://pubchem.ncbi.nlm.nih.gov/compound/46187193#section=Top