Under the surface: "algae" vs. "seaweed"

What is similar?

Both algae and seaweed refer to plant-like organisms that grow in aquatic environments. They are both photosynthetic and contribute to the ecosystems by producing oxygen and serving as food sources for marine life.

What is different?

Algae is a broad term that includes a diverse range of photosynthetic organisms, including microscopic phytoplankton and large kelp. Seaweed is a subset of algae, specifically referring to larger, multicellular forms of algae that are often found in marine environments. Seaweed typically grows in the ocean, whereas algae can grow in both freshwater and marine environments.

Which one is more common?