The PSLV Orbital Experimental Module is a platform which will perform in-orbit experiments through the Polar Satellite Launch Vehicle (PSLV) rocket.
It is a four-stage rocket in which first three spent stages will drop into the ocean and the final stage will end up as space junk after launching the satellite into orbit.
However, in PSLV-C53 mission, spent final stage will be used as a stabilised platform for performing the experiments.
POEM comprises of a dedicated Navigation Guidance and Control (NGC) system for attitude stabilisation.