What's the difference between a seal and a sea lion?

What's the difference between a seal and a sea lion?

Just as I looked up, it dove under. What was it? I watched for a long time and then movement about 30 feet south caught my eye. I turned, and again, missed it. Just the movement of swirling water. 

Determined, I continued to watch. Finally, a round head popped up in front of me about 30 feet out, eyed me for a a couple of seconds only to dive below again.

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