std::wstring VS std::string

I am not able to understand the differences between std::string and std::wstring. I know wstring supports wide characters such as Unicode characters. I have got the following questions:

  1. When should I use std::wstring over std::string?
  2. Can std::string hold the entire ASCII character set, including the special characters?
  3. Is std::wstring supported by all popular C++ compilers?
  4. What is exactly a “wide character“?

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