Wood vinegar, also known as pyroligneous acid or liquid smoke, is a natural liquid produced during the carbonization of wood. It is a byproduct of processes like charcoal making or when wood is subjected to high temperatures in the absence of air. Wood vinegar is a complex mixture of various organic compounds, including acetic acid, methanol, and phenols. It has a smoky aroma and can be used for various purposes, such as in agriculture as a plant growth stimulant, in pest control, and in certain traditional medicines. Additionally, it's sometimes used in food flavoring and preservation, particularly in Asian cuisine.