A hada, khata, katak, or khada is a traditional ceremonial scarf common in Tibetan and Mongolian culture. It symbolizes purity and compassion. It is usually made of silk. Tibetan hadas are usually white symbolizing the pure heart of the giver, though it is quite common to find yellow gold hadas as well. Mongolian hadas are usually blue, symbolizing the sky.
Hadas can be presented along with incense and other religious items at weddings, funerals, births, graduations, arrivals and departure of guests. The Tibetans commonly give a kind acknowledgment of "Tashi Delek" (meaning good luck) at the time of presenting.
In Mongolia, hadas are also often tied to ovoos, stupas or special trees and rocks.