Question: what is the difference between sea and swell?
Answer: What's the difference between Swell, Waves & Seas? Seas are created when the wind blows on the surface of the water, creating movement. ... Generally, "Swell" refers to open ocean waves, "Waves" are what people want to go stick their surfboard on. Seas can sit "on top" of a swell, and ruin a surfers day out.