Robin is Batman's apprentice.
You may be referring to:
- Jason Todd Robin, the second Robin, now known as Red Hood
- Damian Wayne Robin, Batman's son with Talia Al Ghul
- Dick Grayson Robin/Nightwing, the classic Robin, who eventually became the hero Nightwing
- Stephanie Brown Robin, the first female Robin
- Tim Drake, The third Robin
- Carrie Kelley, the female Robin from The Dark Knight Returns who then changed identities to Catgirl in The Dark Knight Strikes Again