Elmo is a four-letter Muppet from the popular children's television show Sesame Street. He is known for his bright red fur, large eyes, and ticklish personality. Elmo is a beloved character who has been featured on the show since the 1980s. He is often seen interacting with other characters, such as Big Bird, Cookie Monster, and Grover. Elmo is also known for his catchphrase 'Oh, boy!' which he often says when he is excited or surprised.