Eurail Passes let you travel on trains all across Europe. Train travel in Europe is comfortable, fast and reliable. Whether your plan is to visit multiple European countries or to explore one country in depth, then a Europe rail pass is your best option because the passes would be cheaper and more flexible than buying individual tickets when you get to Europe.
One Eurail Global Pass allows you to explore up to 28 countries without buying point-to-point tickets. That's why this is considered the "golden ticket" of European rail travel due to the flexibility for unlimited travel within the chosen countries and time frame.