Thai, or Central Thai, is a Tai language of the Kra–Dai language family spoken by the Central Thai people and a vast majority of Thai Chinese. It is the sole official language of Thailand. Thai is the most spoken of over 60 languages of Thailand by both number of native and overall speakers and spoken by approximately 88 percent of the country’s population of around 69 million people. Only 34 percent of Thai speakers in Thailand speak it as a native language.
Thai, also historically known as Siamese, is part of the larger Tai language family, and the “official” version spoken in Thailand is based on the dialect local to the Bangkok region.
Thai is also made up of lots of foreign loanwords from other languages, including Chinese, Pali, Sanskrit, Khmer, Portuguese, Austronesian, and more recently, English.