Propolis or propolis is a resinous mixture produced by bees by mixing saliva and beeswax with exudate collected from tree buds, sap, or other plant sources. It is used as a sealant for unwanted open spaces in beehives. Propolis is used for small gaps (about 6 mm (1⁄4 in) or less), while gaps larger

The composition of propolis varies by hive, region and season. [6] Typically, it is dark brown, but can also be green, red, black, and white, depending on the source of the resin found in a particular hive area. Honey bees are opportunists, gathering what they need from available resources, and deta