The currency used in Japan is Yen with the symbol ￥. It is also commonly associated with the word 円 to be used as a suffix to denote the currency and internationally it’s written as JPY.
For easier conversion, 100 yen is (almost) equivalent to US$ 1.
Although you can pay by credit card in many places, but it may not be as many as we might think, which surprises a lot of visitors to Japan. The Japanese people are very still very much accustomed to paying in cash.
The coins in use are 1, 5, 10, 50, 100 and 500 yen. The coins for 5 and 50 can be confusing at times as they are very similar, except for the color and 50 yen feels slightly heavier compared to 5 yen.
Notes are 1000, 2000, 5000 and 10000 yens. 2000 yen bill is very unusual to find, and even the Japanese themselves are surprised when they see one.