The big bad wolf is a character from a popular children's story called "The Three Little Pigs". The wolf is the villain of the story and is known for trying to blow down the homes of three little pigs.
The wolf is big and fierce looking, with sharp teeth and a hungry belly. He wears no clothes and makes a loud, howling noise. When he meets the pigs, he tries to trick them into letting him inside their homes, so he can eat them.
The first little pig builds his house out of straw, the second little pig builds his house out of sticks, and the third little pig builds his house out of bricks. The wolf tries blowing down the straw and stick houses, but he fails. When he gets to the brick house, he tries to climb down the chimney, but the third little pig has a pot of boiling water waiting for him, which burns him and sends him running away.
The big bad wolf is a symbol for danger and fear in children's stories, and he teaches kids important lessons about being cautious and making smart choices.