Why does not Clang recognize the basic header (iostream)?

Command line:

clang++ "C:\caminho\completo\helloworld.cpp" -o "C:\caminho\completo\helloworld.exe"

Code:

#include <iostream>
using namespace std;
int main(){
    cout << "Ola Mundo" << endl;
    return 0 ;
}

Error:

C:\caminho\completo\helloworld.cpp:1:10: fatal error: 'iostream' file not found
#include <iostream>
         ^
1 error generated.

I have already looked at the internet and for the briefest of my understanding I should use libG ++ from minGW, if so, what is the purpose of clang?