The Netherlands has a very good public transportation network, which makes it easy to get around. You can easily plan your trip with the door-to-door journey planner: http://9292.nl/en/ or download the free 9292 app.
The OV-chipkaart is the means of payment for the entire public transport system throughout the country (bus, train, tramway and subway). The card is the size of a bank card and contains an invisible chip. The OV-chipkaart can be loaded with credit in euros with which you can travel anywhere within The Netherlands. You can click here for more information about the OV-chipcard. You can also buy a single use/disposable OV-chipkaart at train stations. Another option would be the ISIC/OV-chipkaart; a custom-made mobility card for international students with a train discount. Order the ISIC/OV-chipkaart prior to your arrival to Utrecht, don’t wait too long as stock is limited!