Fennel seeds is  often used in food processing. In Vietnam it is used to make curry poder. Some Asian countries, it is used as a medicine.
It is a hardy, perennial, umbelliferous herb, with yellow flowers and feathery leaves
Fennel seeds contain important amounts of oil (2-6%). Essential oils contain 50-60% anethol, estragol,
So it often used as a general tonic to stimulate digestion, diuretic ..