Lymph or lymphatic vessels are the fine tubes carrying the lymphatic fluid and white blood cells all through the lymphatic system.
They are physically similar to blood vessels.
Afferent lymph vessels bring lymph to a lymph node, and efferent lymph vessels carry lymph away from a lymph node.
The lymph flows from efferent lymph vessels to another lymph node, which returns to a vein and then to a bigger lymph duct, which drains the lymph into other veins and sends it to the body.