https://support.chess.com/customer/en/portal/articles/1444857-how-do-i-use-the-game-explorer-
That is the master game database. The above link is screen from the old version of the site but the information is valid.
In your example, from that position, the most common move played was 8... Nd4 at 62 games. White ultimately went on to win 26% of those games, draw 24% and lose 50%.
What do the numbers mean here?