Using internal storage instead of external (SD Card)

And just to be clear,
is the /sdcard path a real external SD card path, and it means devices without sdcard won't run apps with data ?
(or maybe it's a link to a part of internal storage ?)

Beacuse Openframeworks+Android install notes says:

If there's no SD card in the device, examples that have resources won't work right now.

But I've found contradictory informations on web about /sdcard path