Since 1959, Topps has selected an All-Star Rookie Team each year — one player at every position, including DH and RP. The players who make the team get the iconic "Rookie Cup" logo on their card the following season.
Here's what makes Rookie Cup cards special: players who earn the Rookie Cup tend to have outstanding careers. Many become perennial All-Stars and Hall of Famers. So that little gold cup logo on a card isn't just a nice design element — it's historically been a strong signal that you're looking at a player who's going to matter for a long time.
Rookie Cup cards are considered every bit as important as a player's standard Rookie Card in many collecting circles. They're worth paying attention to.