What is c++ <iostream.h> library?

Question

my teacher is using this <iostream.h> library but on the internet everyone is using <iostream>. What different ?

Answer 1

https://www.sololearn.com/discuss/232791/?ref=app
https://www.sololearn.com/discuss/728669/?ref=app
https://www.sololearn.com/discuss/192009/?ref=app
https://www.sololearn.com/discuss/1489805/?ref=app
https://www.sololearn.com/discuss/1522492/?ref=app
https://www.sololearn.com/discuss/711703/?ref=app
https://www.sololearn.com/discuss/122350/?ref=app

Answer 2

"iostream.h is deprecated -- it is the original Stroustrup version. iostream is the version from the standards committee."

Quoted from:
https://stackoverflow.com/questions/214230/iostream-vs-iostream-h-vs-iostream-h