Although popularly considered a single cuisine, Thai cuisine is more accurately described as four regional cuisines corresponding to the four main regions of the country: Northern, Northeastern (or Isan), Central, and Southern, each cuisine sharing similar foods or foods derived from those of neighboring countries and regions: Burma to the northwest, the Chinese province of Yunnan and Laos to the north, Cambodia to the east and Malaysia to the south of Thailand. In addition to these four regional cuisines, there is also the Thai Royal Cuisine which can trace its history back to the cosmopolitan palace cuisine of the Ayutthaya kingdom (1351–1767 CE). Its refinement, cooking techniques and use of ingredients were of great influence to the cuisine of the Central Thai plains.
Thai cuisine and the culinary traditions and cuisines of Thailand’s neighbors have mutually influenced one another over the course of many centuries. Regional variations tend to correlate to neighboring states (often sharing the same cultural background and ethnicity on both sides of the border) as well as climate and geography. Southern curries tend to contain coconut milk and fresh turmeric, while northeastern dishes often include lime juice. The cuisine of Northeastern (or Isan) Thailand is similar to southern Lao cuisine whereas northern Thai cuisine shares many dishes with northern Lao cuisine and the cuisine of Shan state in Burma. Many popular dishes eaten in Thailand were originally Chinese dishes which were introduced to Thailand mainly by the Teochew people who make up the majority of the Thai Chinese. Such dishes include chok (rice porridge), kuai-tiao rat na (fried rice-noodles) and khao kha mu (stewed pork with rice). The Chinese also introduced the use of a wok for cooking, the technique of deep-frying and stir-frying dishes, and noodles, oyster sauce and soybean products