Difference between "Gift to Relative" and "Transfer between Specified Family Member" Shares in Demat

What is Difference between "Gift to Relative" and "Transfer between Specified Family Member", as per Income Tax Act?

NSDL and CDSL online platforms when allowing to do OFF-MARKET Transfer, will ask for the "Reason for transfer"

Therefore, one desiring to do off-market transfer of some shares to a son/daughter is asked to give a reason for off market transfer between "Gift to Relative" and "Transfer between Specified Family Member"

Hence the question: Whether "Gift to Relative" or "Transfer between Specified Family Member" ?

Regards,