The Dubai Metro has two lines, the red line and the green line. The red line runs parallel to the coast and the green line loops around the Old Dubai and canal area. There is also a connection to the Dubai tram line in Dubai Marina.
The Metro fare depends on how many zones are crossed. The base price for 1 zone is less than 1 USD. Multi-ride tickets are available.
The easiest way to use the Dubai Metro is to buy a Nol card which is a re-loadable smart-card. The Nol Card can be used to travel on Dubai's Metro, Buses, Water Buses, Dubai Tram as well as pay for RTA's Paid Parking.