CCG vs LCG vs TCG
CCG (Collectible Card Game) and TCG (Trading Card Game) are interchangeable terms for games sold in randomized booster packs — what's in each pack is a surprise, and rarity creates a secondary trading market. LCG (Living Card Game) is the same genre but sold as fixed-content expansion sets, so every buyer gets the same cards.
Why it matters
The distinction shapes your whole business model. CCG/TCG economics depend on rarity and chase cards; LCG economics depend on cumulative expansion sales. Players generally find LCGs cheaper to "complete" and CCGs more lucrative to publish.
Example
Magic: The Gathering and Pokémon are CCG/TCGs — boosters with random rare cards. Arkham Horror: The Card Game is an LCG — every expansion box has the same fixed list of cards for every buyer.