Biomods are effectively your skills in Subnautica 2. Some are active effects, like dashing to avoid predators or producing a jolt of electricity, but most of them are passive buffs that go a long way in making life under the waves easier.
You'll have access to only a handful of Biomods at the start of the game when you power up the Biolab in the Welcome Center, but once you reach the Alien Ruins and unlock the Bioscanner upgrade, you'll see the full repertoire at the Biolab.
