Linfa is a term that refers to the fluid found in plants, often known as plant sap. This fluid is essential for transporting nutrients, water, and sugars throughout the plant, helping it to grow and thrive. Linfa plays a crucial role in the plant's overall health and development, as it supports various physiological processes. In addition to its role in plants, linfa can also refer to the lymphatic fluid in animals, which is part of the immune system. This fluid helps to transport white blood cells and remove waste products from tissues, contributing to the body's defense against infections and diseases.