A unit of Thai currency is known as a “Baht.” You may sometimes see it written as a “Bath,” but either way it is pronounced to rhyme with “lot.” The Thai Baht can be divided into 100 satang, but single satang coins are no longer in circulation. The only coins smaller than a Baht are the 25 and 50 satang brass coins. Even these are no longer accepted by market sellers or banks. They are used by large supermarkets and 7/11 convenience stores.
Besides the 25 and 50 satang coins, Thai currency also comes in one, two, five and ten Baht coins. The coins are minted in different sizes with the two Baht being larger than the one Baht, the five Baht larger than the two Baht and so on. The one, two and five Baht coins are silver in color, while the ten Baht coin has a brass center with silver on the outer edge.
Thai Baht are also available as banknotes. Each denomination varies in size and color. As with the Thai coins, Thai banknotes increase in size as the denomination increases. The 20 Baht bill is green, the 50 Baht bill is blue, the 100 Baht bill is an orange/red color, the 500 Baht bill is purple and the largest bill is the 1000 Baht white one.
Many hotels in Thailand will accept payment in foreign currency. However, I recommend exchanging the currency from your home country at the airport when you arrive to Thailand. You will receive the best rate of exchange at the airport.