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Showing content from https://en.cppreference.com/w/cpp/language/../io/../header/iostream.html below:

Standard library header <iostream> - cppreference.com

This header is part of the Input/output library.

Including <iostream> behaves as if it defines a static storage duration object of type std::ios_base::Init, whose constructor initializes the standard stream objects if it is the first std::ios_base::Init object to be constructed, and whose destructor flushes those objects (except for cin and wcin) if it is the last std::ios_base::Init object to be destroyed.

[edit] Synopsis

#include <ios>
#include <streambuf>
#include <istream>
#include <ostream>
 
namespace std {
  extern istream cin;
  extern ostream cout;
  extern ostream cerr;
  extern ostream clog;
 
  extern wistream wcin;
  extern wostream wcout;
  extern wostream wcerr;
  extern wostream wclog;
}

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 155 C++98 the type of the static object was std::basic_ios::Init
(not strictly wrong, but the wording was misleading) corrected to std::ios_base::Init LWG 1123 C++98 including <iostream> did not guarantee the
construction of std::ios_base::Init objects guarantees

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