Tree exudate is a liquid or semi-solid material that is released from the roots, stems, and leaves of trees. It is composed of a variety of organic compounds, including sugars, amino acids, hormones, and other substances. The term 'SAP' is often used to refer to tree exudate, as it is the most common type of exudate. SAP is typically clear or slightly yellowish in color and has a sweet taste. It is an important source of nutrition for many organisms, including insects, birds, and mammals.