What cinematic universe includes the characters Rocky Balboa and Adonis Creed?

The Rocky/Creed universe began with 'Rocky' (1976), which won the Oscar for Best Picture and catapulted Sylvester Stallone to stardom. After six films centered on Rocky Balboa, the franchise continued with 'Creed' (2015), focusing on Adonis Creed (Michael B. Jordan), son of Apollo Creed, with Rocky as his mentor. This sequel revitalized the saga for a new generation of viewers.