Tetraethylammonium tetrafluoroborate is classified as a quaternary ammonium salt, consisting of a positively charged tetraethylammonium cation and a negatively charged tetrafluoroborate anion. This compound is often utilized as a phase transfer catalyst in organic chemical reactions to facilitate the movement of reactants between immiscible phases. It also serves as a reagent in the synthesis of various organic compounds, an electrolyte in electrochemical experiments, and a source of tetraethylammonium ions in biochemical and pharmacological research.