Organ sections, or lobes, refer to the distinct parts of an organ. The lobes are typically divided by fissures, which are grooves or indentations in the organ's surface. Lobes are commonly found in the lungs, liver, and brain. In the lungs, the lobes are divided into the right and left upper and lower lobes. The liver is divided into four lobes, while the brain is divided into two hemispheres, each of which is further divided into four lobes.