When I first saw this sealion at Marineland in Antibes, I thought it was a silver statue due to the water reflection. It was just preening and posing for the camera.
Sealions are Pinnipeds [which means fin feet] - as are walruses, fur seals and earless seals [true seals]
This one is a California sealion Zalophus californianus.
Sealions differ from seals in that they have small external ears and longer flippers that they can 'walk' with. You can see the small ear flap here.
True Seals have no external ear flaps and are also much clumsier on land than sealions - they have to wriggle along [galumph] mainly using their belly muscles and it takes a lot of effort. They are more adapted to life in the open sea than sealions, who tend to prefer coastal waters.