The most popular mode of transportation in Rome is trams and buses. By the way, buses come in two types - regular and electric (in other words, our trolleybuses). The cost of transportation in Rome is affordable - a 100-minute ride on a bus, tram, or trolleybus costs 1.50 EUR.
You can buy tickets at vending machines or tobacconists, drivers sell tickets only at night. Right now you can calculate an approximate route (you can specify not only stops, but also sights that you need to get to) around the city on the main transport city website.
If you wish, you can buy a Roma Pass and ride public transport in Rome for free.
