Thai, or more precisely Siamese or Central Thai, is the national and official language of Thailand and the native language of the Thai people, Thailand's dominant ethnic group. Thai is a member of the Tai group of the Tai–Kadai language family. Some words in Thai are borrowed from Pali, Sanskrit and Old Khmer. It is a tonal and analytic language. Thai also has a complex orthography and relational markers. Thai is mutually intelligible with Lao, though Lao speakers more easily understand Thai than Thai speakers understand Lao, because Lao speakers have more exposure to Thai. Wikipedia