Saffron is a flower. It has a bright yellow/orange in color and a distinctive taste; try it on rice and other bland starches. It can be used in various desserts like Kheer, Halwa, etc. for flavor.
Medicinal uses: 
◦Menstrual condition
◦Antispasmodic
◦Flatulence
◦Sedative
◦Menstrual disorders