Hello Aspirant

JOSAA is a common platform for admission to NITs, IIITs, IITs, Government Funded Technical Institutes, etc. A Single application and choice filling list has to be submitted to get admission through JOSAA in any of these universities.

Till 2014, CSAB was for admission to NITs, IIITs, etc. and there was separate platform for admission to IITs. But Since 2015, both of them have been merged to make the entire process more easier and simpler.

Yes, you are supposed to apply on both the platforms but you should know that JOSAA counselling and CSAB counselling are not held separately.

After completion of all round of JOSAA counselling CSAB conducts spot round on remaining seats for Nit , IIIT and GFTIs. If you have already participated in JOSAA counselling and you were not allotted a seat in any round, you can  register for CSAB too.

Hope this helps