Interrail is the unique and fully flexible way of travelling by train in Europe. With an Interrail Pass you can choose and travel unlimited between 40.000 destinations in 31 European Countries, it´s just up to you to decide where to go next.
The Interrail Pass is essentially a train ticket that is valid for multiple days, with access to 37 railways and multiple ferry lines. On the vast majority of the routes you can use your Interrail Pass as the valid ticket, but on certain routes (and especially on night trains) seat reservations are required. Read more about seat reservations here.
NB: The Interrail Pass is also known as the Interrail Global Pass