Thai is a Tai-Kadai language spoken by about 65 million people mainly in Thailand (ประเทศไทย), and also in the Midway Islands, Singapore, the UAE and the USA
Thai is closely related to Lao, and northern dialects of Thai are more or less mutually intelligible with Lao, particularly the Lao spoken in northern Thailand. Thai vocabulary includes many words from Pali, Sanskrit and Old Khmer.
Thai alphabet (ตัวอักษรไทย)
The Thai alphabet was probably derived from, or at least influenced by, the Old Khmer alphabet. According to tradition it was created in 1283 by King Ramkhamhaeng (พ่อขุนรามคำแหงมหาราช).
The Thai alphabet is used to write Thai, Sanskrit, Pali, and a number of minority languages spoken in Thailand.