Lymph is an alkaline fluid that originates as interstitial fluid in your body. In this context, an interstitial space is basically an empty space between tissue structures. Interstitial fluid flows in the space between and around tissues and cells. You might compare this space to the holes in a sponge. Just as these holes fill up with water and keep the material of a sponge wet, the fluid that becomes lymph bathes and nourishes in the cells of all your tissues.
Lymph is collected within lymphatic vessels, which carry it away from your tissues and eventually return it to your bloodstream. Lymph helps clear your body of cellular wastes and infectious organisms. Chyle, a specialized version of lymph, transports fats from your intestine to your bloodstream