Over the years, the Call of Duty franchise has evolved, introducing numerous gameplay features with each part of the series. This includes elements like operators, which are present in the latest entry, Black Ops 6.
To put it short, operators are skins for your player character in Call of Duty multiplayer modes. These skins are usually characters known from single-player campaigns, like Frank Woods, the face of the Black Ops franchise. Not every operator is available from the get-go. In fact, there are different criteria for unlocking them while playing Black Ops 6.