Jumpstart codes are alphanumeric codes used in the Pokémon Trading Card Game Online (PTCGO) and Pokémon TCG Live to redeem digital cards and items. These codes are often found in physical Pokémon TCG products like booster packs, theme decks, and promotional items. Redeeming a Jumpstart code in the game adds the corresponding digital cards, booster packs, or cosmetic items to your online collection, allowing you to play and build decks in the virtual game environment. They are a key component of bridging the gap between the physical and digital aspects of the Pokémon TCG.