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Power socket types around the world
(upload.wikimedia.org)
For the map enthused!
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Power socket type variance is just a symptom of the underlying issue of historic networks whose requirements were or are adjusted to the given conditions of electric power generation, transport or consumption.
We have different operating frequencies here in Japan depending upon which part you're in. Some is 50hz some is 60hz.
Are devices generally interoperable?
These days, yes. Older devices were usually only made for one frequency or the other. Clocks, for example, would not keep time correctly if they were using the cycles as a way to count time and were used in the opposite area for which they were designed.