Lymph is a colourless fluid that contains white blood cells and is produced from the filtered out product of the blood capillaries.
The main function of lymph is to transport nutrients such as oxygen and glucose in the body and also forms the immune system of the body.
The Lymph is composed of plasma that is the most significant part of the blood(about 55%), and its function is to take nutrients, hormones, etc. to the cells that need it.
It is also composed of white blood cells that protect the body from foreign pathogens, bacteria, etc.
It is also composed of platelets, and these are responsible for blood clotting at the time of injury.