getting **'String' was not declared in this scope** error

I am coming from Java and I’m new to C++. I’m trying to declare a String:

#include <iostream>

using namespace std;

int main()
{
    String str = "ABC";
    cout << str << '\n';
}

but it gives an error:

 error: 'String' was not declared in this scope
   17 |         String str = "ABC";

Why is this happening?

>Solution :

"String" should be lowercase.
You will also need to import the string library, which is done by

#include <string>