Definition
A lymph node is a small, bean-shaped structure that is part of the lymphatic system. These nodes act as filters for the lymph, a fluid containing white blood cells. Lymph nodes trap pathogens, cancer cells, and other foreign substances. Inside the node, immune cells attack and destroy these harmful elements. They are concentrated in areas like the neck, armpits, and groin. Think of them as tiny "security checkpoints" throughout your body.