Lymph is a clear fluid that circulates throughout the body, playing a crucial role in the immune system. It is part of the lymphatic system, which helps remove waste, toxins, and excess fluids from tissues. Lymph contains white blood cells, particularly lymphocytes, which help fight infections and diseases. As lymph travels through the body, it passes through small structures called lymph nodes. These nodes filter the lymph, trapping harmful substances like bacteria and viruses. This process helps keep the body healthy and supports the overall function of the immune system, ensuring that we can effectively respond to illnesses.