As with any city, you’ve got options for getting around Dublin. You can hop aboard a Dublin Bus with an extensive network reaching across the county. There’s a coastal train line, the DART, which stops at seaside towns from Greystones in the south to Malahide and Howth in the north. There’s a light rail system, the LUAS, with the Green Line heading south from the city to Bride’s Glen (work on an upgrade is in progress) and the Red Line heading west to Saggart. Dublinbikes, the most successful citywide bike hire scheme in Europe, is loved by the locals. Beyond that there’s plenty of taxis, or you can hire a car.
The integrated public transport ticket is called the Leap card and offers discounts on standard cash fares and is used across public bus and rail. If you’re just visiting, you can get a Leap Visitor Card at the airport.