Roma Termini (in Italian, Stazione Termini or Stazione di Roma Termini) is the main train station of Rome. It is named after the ancient Baths of Diocletian (in Latin, thermae), which lie across the street from the main entrance.
The station has regular train services to all major Italian cities as well as daily international services to Paris, Munich, Genève and Basel. With its 29 platforms and over 150 million passengers each year, Roma Termini is one of the largest train stations in Europe.
Termini is also the main hub for public transport inside Rome. Both current Rome Metro lines (A and B) intersect at Termini, and a major bus station is located at Piazza Cinquecento, the square in front of the station. However, the main tram lines of the city cross at Porta Maggiore, some 500 metres east of the station.
On 23 December 2006, the station was dedicated to Pope John Paul II[2], more or less like Rome's main airport at Fiumicino is dedicated to Leonardo da Vinci (taken from Wikipedia)

Rome Termini is an underground station of the Rome Metro. The station was inaugurated on 10 February 1955, as a station on Line B and later became an interchange with Line A. The station is found in Piazza dei Cinquecento, underneath the Termini rail terminal. Together, the two stations form the main public transport hub in the city (taken from Wikipedia).