Here's a breakdown:

* Cellular respiration is a series of chemical reactions that occur in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.

* ATP is the primary energy currency of cells and is used to power various cellular processes.

There are three main stages of cellular respiration:

1. Glycolysis: This occurs in the cytoplasm and breaks down glucose into pyruvate. It produces a small amount of ATP.

2. Krebs cycle (or Citric Acid Cycle): This occurs in the mitochondria and further breaks down pyruvate, generating more ATP and electron carriers (NADH and FADH2).

3. Electron transport chain: This also occurs in the mitochondria and uses the electron carriers to drive the production of a large amount of ATP through oxidative phosphorylation.

While cellular respiration primarily uses glucose as fuel, other molecules like fatty acids and amino acids can also be used to generate energy through this process.

It's important to note that photosynthesis, the process plants use to convert light energy into chemical energy, is also a metabolic process. However, it doesn't directly produce energy in the form of ATP. It creates glucose, which is then used by the plant in cellular respiration to produce ATP.