What is that white stuff on top of waves? Storms stir up seafoam along Central Coast - San Luis Obispo Tribune

What is that white stuff on top of waves? Storms stir up seafoam along Central Coast - San Luis Obispo Tribune https://www.sanluisobispo.com/news/weather/weather-watch/article259390359.html What is that white stuff on top of waves? Storms stir up seafoam along Central Coast  San Luis Obispo Tribune