Traditional Card Games is not an individual game, but a game system including games that can be played with a traditional deck(s) of cards.
This database entry covers all card games that can be played with a standard deck of cards. Not all card games played with standard playing cards can be mentioned separately in BGG's database, and many regional card games that aren't as widespread as popular games like Poker or Blackjack.
The standard deck playing card games page lists many of the card games that are listed separately in the BoardGameGeek database. Many are also included in the list of games belonging to the Traditional Card Games family.
Related BGG Database Entries:
Bicycle Official Rules of Card Games (Book)
The Penguin Book of Card Games (Book)
Card Games Around the World (Book)
Miscellaneous Card Game Accessory
Related BGG Resources:
Articles About Playing Cards
40+ Great Card Games For All Occasions
Favorite Games with Standard Playing Cards
Pictorial Reviews of Custom Playing Cards
Playing Card Games Enthusiasts (Guild)