It is what the bee took from medicinal herbs and processed them. It is also known in Japan as a health food.
This is also the substance that European bees paint their nests for keeping them clean and strengthening their nests. In addition, they are mummified in propolis to prevent them from rotting, which can’t be released (for example, large enemies that come in and workers who are caught in nets, etc.).

Japanese bees, by the way, don’t create propolis. Because they move to a new one when their nest is damaged.
Propolis is produced by Killer bees in South America it is not just the production of propolis, it is the production of propolis In Brazil. Brazil has the world's highest propolis production.