This document provides an overview of organic chemistry. It discusses how organic compounds were originally classified based on their origin from living things, while inorganic compounds came from mineral sources. It then explains the vital force theory proposed in 1815, which stated that organic compounds could only be created by living things. However, in 1828 Friedrich Wohler synthesized urea from inorganic compounds in the laboratory, rejecting the vital force theory. The document also provides modern definitions of organic compounds as those containing carbon along with other elements like hydrogen, oxygen, nitrogen, and halogens. It notes some exceptions and discusses key aspects of organic chemistry.