By far the fastest and most convenient way to get round Paris. Tickets can be bought as singles(€1.40) or in a carnet of 10(€10.70), or there are passes such as Paris Visites with a choice of 1, 3 or 5 days to travel zones 1-3. Tickets must be validated before travel and kept to avoid on the spot fines at your destination. RATP tickets can be used for both Metro and bus. Separate tickets must be bought for travel on the suburban RER trains.