A khata, or khadag is a traditional ceremonial or offering scarf used in Tibetan and Mongolian culture and in Tibetan Buddhism. The Khata symbolises purity and compassion and is usually made of silk or silk like material. Tibetan Khatas are most commonly white symbolising the pure heart of the giver, or gold / cream. They also come in a varirty of other colours and are rich in design with auspicious symbols and mantras. Khatas 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 the Khata.
Above and below you can see how Khatas are placed at the highest points over these mountain passes in Tibet. They are mixed in with Prayer flags as offerings. To the right you can see a statue of Avalokiteshvara (Chenrezig) thousand arm in a monastery in Tibet. Again Khata offering scarves are placed on the statue and around as offerings to the deity.