The ITAS/KITAS is like a student visa. It is obtained immediately after arriving in Yogyakarta and the paperwork is facilitated by IOSS.
Izin Tinggal Terbatas (Temporary Stay Permit). The stamp (pictured on the right) in the passport.
Kartu Izin Tinggal Terbatas (Temporary Stay Permit Card). The yellow card that you will be given. Must be kept in the passport.
The II marked at the top-left corner indicates that this ITAS/KITAS is the second one issued to this person. The ITAS/KITAS expires every year and can be extended yearly and also for two years at a time.
Now, an e-KITAS ("for electronic use only") plastic card is issued instead of the yellow card.