Thai is the official language of Thailand, natively spoken by, according to Ethnologue, over 20 million people (2000). In reality, the number of native Thai speakers is likely to be much higher, since the Thai people of ethnic Chinese origins throughout the country learn it as their first language. Thai, Central Thai or Ayutthaya or Siamese, is the sole official and national language of Thailand and the first language of the Central Thai people and vast majority of Thai of Chinese origin. It is a member of the Tai group of the Kra–Dai language family.
Related languages. Isan (Northeastern Thai), the language of the Isan region of Thailand, a collective term for the various Lao dialects spoken in Thailand that show some Central Thai influences, which is written with the Thai script. It is spoken by about 20 million people.
Thailand is a country that you can live and very freely to do anything. Yes it has some limitations, but for living, such as food, accommodations, taxes, laws, religion influence, making money, it's pretty good here.
Speaking spoken Thai is not as difficult for other native tonal language speakers like Chinese as they are used to tones. Furthermore, some variety of Chinese language eg. Cantonese has distinction of short and long vowel length which also exist in Thai.