A rail pass is a pass that covers the cost of train travel in a certain designated area or areas within a certain period of time. It is contrasted to a point-to-point ticket in that it allows the holder unlimited travel, within the pre-designated area and period, while a point-to-point ticket only permits the holder to travel from a point to another once. It is different from a season ticket in the sense that, while both of them grant unlimited travel to the holder, season tickets normally target commuting travellers, whereas rail passes usually target tourists. Based on this difference, terms of use are thus normally set differently.

The Interrail Pass is a rail pass available to European citizens and residents. Citizens of other countries residing outside Europe may purchase the Eurail Pass instead. Types of Interrail Pass include the Interrail Global Pass and the Interrail One Country Pass.