What is mean by Defobcs & Defopens

Hello aspirant!
Hope you are doing well!

I think, you have misunderstood some acronym.
The category must be DEF, OBC
DEF- Ward of ex-service personnel
OBC- Other Backward Classes ( OBC ).

There are 3 types of DF subcategory

• Ward of ex-service personnel who is domiciled in Maharashtra state (DEF-1)
• Ward of active service personnel who is domiciled in Maharashtra state (DEF-2)
• Ward of active service personnel (DEF-3) who is transferred to Maharashtra state but is not domiciled in the state, or who is not domiciled in Maharashtra state but their parents are residing in the state.
  
  Hope this helps!