Parenchyma is a type of plant tissue that is fundamental for various functions, including photosynthesis, storage, and tissue repair. It consists of living cells that are typically thin-walled and can vary in shape. This tissue is found in many parts of the plant, such as leaves, stems, and roots, playing a crucial role in the plant's overall health and growth. In animals, parenchyma refers to the functional tissue of an organ, as opposed to the supportive or connective tissue. For example, in the liver, the parenchyma is responsible for vital functions like metabolism and detoxification. Understanding parenchyma is essential for studying both plant and animal biology.