GSLV is made of three different stages. At different points of time each stage separates. The uppermost stage is the cryogenic stage which will put the satellite or payload in its intended orbit. You can read about the GSLV Mk III – A Comprehensive Overview of Heavy Lift Launch Vehicle in the given link.
Further readings:
- Indian Space Research Organisation [ISRO Notes for UPSC]
- Mars Orbiter Mission (MOM) – A Complete Overview of Mangalyaan Mission
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