What is Co-Branding?

Co-Branding of Airtel and PepsiCo Have you watched the ad which sells mobile data along with a packaged snack? If not, then just invest a minute on watching this ad for getting a better understanding on Co-Branding. https://www.youtube.com/watch?v=p7-dvcWMKMQ This is a new festive television commercial promoting free airtel data along with a packet of Kurkure...