The Kagyu school, also transliterated as Kagyü, or Kagyud, which translates to "Oral Lineage" or "Whispered Transmission" school, is one of the main schools of Tibetan Buddhism. The Kagyu lineages trace themselves back to the 11th century Indian Mahasiddhas Naropa, Maitripa and the yogini Niguma, via their student Marpa Lotsawa (1012–1097), who brought their teachings to Tibet. Marpa's student Milarepa was also an influential poet and teacher.

The Tibetan script is a segmental writing system (abugida) of Indic origin used to write certain Tibetic languages, including Tibetan, Dzongkha, Sikkimese, Ladakhi, Jirel and Balti. It has also been used for some non-Tibetic languages in close cultural contact with Tibet, such as Thakali and Old Turkic. The printed form is called uchen script while the hand-written cursive form used in everyday writing is called umê script. This writing system is used across the Himalayas and Tibet.