Tickle Me Elmo is a stuffed animal toy that was very popular in the 1990s. It's a toy that looks like the character Elmo from the children's TV show Sesame Street. When you tickle him, he laughs and giggles and bounces around.
Elmo has a special button on his tummy that makes him laugh when you press it. But when you tickle him on his feet or his tummy, he reacts in a more realistic way - by wriggling and laughing harder. This is because there are sensors inside the toy that detect when it's being tickled.
Tickle Me Elmo became a very popular toy because it was so much fun to play with. It was especially popular with children who loved to tickle him and hear him laugh. Some people even made videos of themselves tickling the toy and posted them online.
In conclusion, Tickle Me Elmo is a fun toy that reacts when you tickle it. It was very popular in the past and is still loved by many children today.