Hello pankaj,  Mass is the matter present in material or body.  Mass never depends on gravity.  That's why it is same at anywhere.  Mass never changes depending on place.

while weight is also a matter present in body, but it considers gravity effect. weight of the same thing  is different at different places. Weight may get changes depending on place, as gravity changes place to place.

most important difference is mass value is never 0 . While weight value may be zero, according to gravity effect.

thanks.