"No boil hops" could just mean no hops at all... But you can also add hops after the boil is done (in the whirlpool), or during fermentation, or after fermentation. Some people even add them to the kegs. The last 3 options can be considered drop hopping. You can do any and all of these, multiple times, when making beer.Is "no boil hops" the same as dry hopping?