Sap was a fluid substance produced from various types of trees throughout the galaxy. It came in various colors, such as amber, brown, and purple. It was often used as an ingredient to produce foods and beverages. Some saps were able to be consumed raw when hardened, such as the ones collected from Tenoo trees, being compared to eating a candy.
In 232 BBY, during the heights of the Jedi Order; a cafe in the town of Kublop Springs, Hap's Sap Tap, served various beverages based on saps. The proprietary of the establishment, Hap, often invented his own twist on sap beverages.
During the Clone Wars, in 20 BBY; a clan of Nightsisters led by Mother Talzin concocted the healing potion, Water of Life, which used saps as one of its ingredients. They offered the liquid to baptize Asajj Ventress into a Nightsister.
A sap refinery on Kashyyyk
In 14 BBY, during the reign of the Galactic Empire; the planet Kashyyyk was under Imperial occupation. They had built a sap refinery within its forests. The Partisan leader Saw Gerrera suspected that the refinery turned the saps into a powerful compound. On his way to help liberate the Wookiees, the Jedi Cal Kestis explored the facility, seeing pools of sap collected from the wroshyr tree being mixed and processed.
The human Holshef was a sap collector who gathered saps of the greel-wood trees on the planet Lothal. He used the saps to be turned into greel-wood syrups. However, by 4 ABY, he had become an artist and a poet, using his talent to express his disdain against the Empire.