The electrical current in France is 220 volts, 50 cycles alternating current (AC); electrical outlets take Continental-type plugs, with two round prongs. So you may need to use both an adapter (which enables you to plug your appliance into the different style of socket) and a converter (which allows it to run on the different voltage). Most laptops and mobile phone chargers are dual voltage (i.e., they operate equally well on 110 and 220 volts); hence they require only an adapter. These days the same is true of many small appliances, but you should always check labels and manufacturer instructions to be sure. Don't use 110-volt outlets marked "for shavers only" for high-wattage appliances such as hair dryers.
Adaptelec. Adaptelec has information on electrical and telephone plugs around the world (search "France" for detailed coverage). www.adaptelec.com.