A rail pass is a ticket that allows unlimited travel on a specific train network for a set period. These passes are popular among travelers who want to explore multiple destinations without purchasing individual tickets for each journey. They can be used on various types of trains, including high-speed and regional services, depending on the pass type. Many countries offer their own versions of rail passes, such as the Eurail Pass in Europe or the Japan Rail Pass. These passes often provide significant savings and flexibility, making them an attractive option for tourists and locals alike who frequently use the train system.