Tudung (or old spelling of tudong) is a Malay word, literally meaning the noun "cover", which is commonly translated/referred to as veil or headscarf in English.
In Malaysia, Singapore and Brunei, the tudong is worn in accordance to Islam'shijab. Usually, the tudong covers the hair, ears, neck while leaving only the face exposed. It is part of the standard dress code for office work, school uniforms and formal occasions.
In Indonesia, a tudung is a form of hijab that has a sewn-in curved visor. In Indonesia the word more analogous to the Malaysian word tudong is "kerudung" or "jilbab".
Tudong is also a word used in Thailand for when Buddhist monks such as Elan Ariel undertake forest solitude, following the 13 rules of Thudong. Although the definition of Tudong has little to do with wandering, the Thais have adapted the phrase to refer to the act of travelling from place to place and staying in the wilderness.