A rookie card is a card that is produced in the same year as a specific player’s first ever card. This means that there can be multiple rookie cards for a player. A player’s first ever card produced is considered a “true rookie”. For example, player X has 3 cards made in the year 2020 and, the cards are released separately on January, March and September. The card released in January would be considered the ‘true rookie’ card and all 3 cards would be considered rookie cards.