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Amines are classified by the number of carbon groups bonded to nitrogen, while IUPAC names use an amine suffix and N-prefixes to identify substituents attached to nitrogen. Their nitrogen is generally trigonal pyramidal and can undergo rapid inversion; quaternary ammonium ions are permanently charged and differ in geometry and configurational stability. Hydrogen bonding, chain length, and charge influence solubility and boiling behavior. Basicity varies with substitution, hydration, electron-withdrawing groups, and aromatic conjugation. The topic also introduces characteristic infrared and NMR features and shows how amine basicity and nucleophilicity underpin reactions such as alkylation, acylation, nitrosation, and diazotization.