The Japan Rail Pass ( known as JR Pass) is a multi-use ticket which offers incredible value for money. It is valid for journeys on all JR national trains including Shinkansen bullet trains and Narita Express trains. Passengers can select a pass which is valid for 7, 14 or 21 days and there is the option of Standard Pass or a Green Pass (first class).
Order your JR Pass online and you will receive an Exchange Order which you can swap for a JR Pass when you arrive in Japan.
It's often worth buying a JR pass, since travel costs in Japan are very high, but it's important to plan your route in advance and calculate the cost of every individual ride and the overall number of rides. Such a calculation can be done via Rome2Rio. For example, if your plan is to make one ride from Tokyo to Kyoto, your costs would be 100-150$, which are cheaper than a 7 day pass (265$), However just one more ride would make purchasing a JR pass more sensible.