is the insertion tag(<<) in c++ A stream or just cout

Answer 1

"<<" is an overloaded operator, which is overloaded to be a put() function.

cout << "x = ";

is the same as

put(cout,"x = ");

that's why here👉(https://www.sololearn.com/discuss/2312863/?ref=app) when you were using it inside cin, then it was same as
put(cin,"\n") which is not possible.