What games are in the database?

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Lord_Sweeney

On Chess.com, when you look at something like the Openings database which shows you how many games have been played in a certain board position and the win/loss ratio, what games make up that database? Are they Chess.com games? Or professional games? Historical games? I'm not sure how much credence to give to the database as I don't know if it's pulling from all players at all levels vs. only high-level players, for instance.

AtaChess68
Master games.