What’s the difference between kelp and seaweed?
Trick question! Kelp is a type of seaweed. There are over 15,000 species of seaweeds, grouped in three main categories: brown, green, and red seaweeds. Brown seaweeds are commonly called kelp. And if you were wondering, spirulina is seaweed’s tiny cousin. While all seaweeds are macroalgae, spirulina is a type of microalgae.