As most teams do, the St. Louis Cardinals have their own personal Hall of Fame which allows them to immortalize their own players that have played a big role in the history of the franchise. Of course, anyone who is in the National Hall of Fame will likely get into the Cardinals Hall, but there is a chance to include many more Cardinal-specific players.
Rather than there being some committee or group designated to decide who gets in and who doesn’t, the Cardinals Hall of Fame is voted on (in part) by you, the fan. This also makes it more special.