International Electrotechnical Commission has a very handy (especially before travelling to a foreign country) list of different plugs (a total of 14 at the time of this writing), mapped to countries of the world. So if you don’t have one of these:
make sure you check the list before you fly out. And while on the topic of this great variety, IEC also explains why there are so many and if this annoyance will ever be sold:
The IEC issued its International Standard for a universal plug in the 1970s; so far it has been adopted by Brazil and South Africa. It is unlikely that there will be a run on the standard in the near future. Literally hundreds of millions of plugs and sockets have been installed and who would convince a country to invest now in changing its whole infrastructure?
Most likely the future will lie with solutions such as the USB plug or possibly a multi-plug that can accommodate many different plugs, or even new technologies such as LVDC (low voltage direct current) or wireless charging mechanisms.