Dear spirant,

The Joint Seat Allocation Authority (JoSAA) is a counselling for candidates who have cleared both JEE Mains and JEE Advance.

The Central Seat Allocation Board (CSAB) is a special counselling,conducted after JoSSA admission process. To fill the vacant seats in IIITs, NITs and GFTIs, CSAB counselling is conducted. Students with valid JEE Mains score are eligible for this,

Hope this helps!

HI..

Aspirant as I can that you have enquired the difference between JOSAA and CSAB So, candidate I would like mention here that the difference is JOSAA itself completes its admission process for IITs, NITs . But CSAB conducts 2 rounds to fill up for all the vacant or remained seats in  NITs, IIITs .

hope this helps

all the best.