What is lymph? How is it different from blood?

Lymph is a fluid that contains infection-fighting white blood cells. When blood reaches the capillaries, some of the water and dissolved solutes are filtered out from the plasma into tissue spaces to form a tissue fluid called lymph. Some of this lymph enters tiny channels called lymph vessels.

Difference between Blood and Lymph — Basically, lymph has all the elements of blood except RBCs and blood platelets. It is slightly yellowish in colour and contains special type of white blood cells called lymphocytes.