The Tricarboxylic Acid Cycle, also known as the Krebs Cycle or Citric Acid Cycle, is a series of chemical reactions in the mitochondria that generates energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins. It plays a crucial role in cellular respiration, producing high-energy molecules like NADH and FADH2, which are essential for ATP production in the electron transport chain.