Type C is the most common outlet used in Europe. It is sometimes called the "Europlug." It is not grounded and includes two rounded 0.157-inch pins. It is 250 volts and widely used in all of Europe.
The type C plug can be used in Type E, Type F, Type J, Type K and Type L outlets. It can also be forced to work with Type D and Type G sockets.
Types D and G outlets are used in the United Kingdom and Ireland. The Type D outlet is used in the U.K. and its former colonies. It has three round pins that are in a triangular formation. It is rated at 250 volts. The Type G also has a three-pin design with triangular formation. The pins are not round but rectangular. The type G plug contains a fuse inside it. This outlet is not compatible with type C plugs.
Type E outlets are used in France. Type E plugs are also used in Poland, Czech Republic and Slovakia. The Type E looks much like the Type C except the socket has a ground pin that sticks out and goes into a hole in the plug. It is compatible with type C plugs.
Type F outlets are used in Germany. The Type F socket has two small grounding clips on the side. The plug has two indentations for those clips. The Type F is found in: Albania, Austria, Bulgaria, Croatia, Estonia, Finland, Germany, Greece, Hungary, Iceland, Italy, Latvia, Luxembourg, the Netherlands, Norway, Portugal, Romania, Russia, Serbia, Slovenia, Spain, Sweden and Ukraine. It is compatible with type C plugs.
Type J outlets are used in Switzerland and no where else. The Type J looks similar to the Type C except that it has a small hole for a ground pin slightly below and between the two main prongs. It is compatible with type C plugs.
Type K outlets are used in Denmark. Type K plugs are used only in Denmark and have a semi circular ground outlet. Type K plugs have a semi circle pin for that ground. Type K outlets are compatible with type C plugs.
Type L outlets are used in Italy. Type L outlets are exactly like Type C outlets except there is another identical pin in the center of the two main pins for ground. They are compatible with type C plugs.
