Smeds are fictional creatures from the children's book "The Smeds and the Smoos," written by Julia Donaldson and illustrated by Axel Scheffler. They are characterized by their blue color and unique, round bodies. Smeds live on a distant planet and are known for their friendly and playful nature. In the story, Smeds have a longstanding rivalry with another group called Smoos, who are red and have a different appearance. The tale explores themes of friendship and acceptance as the two groups learn to overcome their differences and work together.