Who is Batman's partner?

Robin is an American comic strip character created for DC Comics by writer Bill Finger and artist Bob Kane. Debuting in Detective Comics no. 38 (April 1940), Robin was introduced as a junior crime-fighting partner for Batman, and he served as the template for later teenage sidekicks. Robin accompanied Batman on a host of 1940s and ’50s escapades in Detective Comics, Batman, and World’s Finest Comics, protecting Gotham City from routine thugs and a growing contingent of colorful rogues, including the Joker, Catwoman, and the Penguin.

Source: Britannica