DLC in Cyberpunk 2077 features additional content of the game that is not available with the regular edition of the game. DLC usually contains pre-order bonuses, free additional content, paid packs, and game expansions.
Cyberpunk 2077 DLC
Will there be DLC for Cyberpunk 2077?
Although Cd ProjektRED haven't officially announced anything, the concept behind the DLC release is similar to what CD ProjektRED did with The Witcher 3. The idea is to release "at least" two big paid DLC expansions but, as has been the case with the Polish company, accompany it also with many small and free updates, such as cosmetics, quests, etc.
CD ProjektRED have stated that the constant delays Cyberpunk 2077 suffered during its development has affected the roadmap and initial announcement plans for the DLC content. As such, there is no clear release date. The company has stated that for now the focus is the main game.