Cells get their energy primarily from a process called cellular respiration. This is like a series of chemical reactions that break down food (like glucose) and release energy in the form of a molecule called ATP (adenosine triphosphate). ATP is the cell's energy currency – it's used to power all the cell's activities, like growth, repair, movement, and communication.

Here's a simplified explanation:

1. Glycolysis: The first stage happens in the cytoplasm. Glucose is broken down into pyruvate, releasing a small amount of ATP.

2. Krebs Cycle: Pyruvate enters the mitochondria, where it is further broken down. This generates some ATP and electron carriers (NADH and FADH2).

3. Electron Transport Chain: This is the final stage. The electron carriers deliver electrons to a chain of proteins in the mitochondrial membrane. This creates a proton gradient, which is used to generate a large amount of ATP.

In summary, cells get energy by breaking down food through cellular respiration and using the released energy to create ATP.

Let me know if you'd like a more detailed explanation of any of these steps!