Why do different countrys have different plugs?

Question

Why do different countrys have different plugs?

Answer 1

safety and what not...

like in Australia they have three prongs facing slightly inwards which makes

it one of the safest wall plugs to use

Answer 2

to annoy people!!!

Answer 3

i don't know but it's a huge pain. It seems like its the worst for us americans because not only do we have to buy adapters to fit our plugs in other countries sockets, but we also need voltage converters since every country but ours uses the same voltage! and its expensive!