The Krebs cycle, also known as the citric acid cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins into carbon dioxide and chemical energy in the form of ATP. This cycle is a crucial part of cellular respiration, providing high-energy electrons to the electron transport chain and playing a pivotal role in the metabolic pathway for energy production.