There are many of these games out there, based on every possible subject, from the bible to Star Wars, vampires, and even Monty Python. The collectable side comes in roughly the same form as baseball cards. A lot of the cards are very rare and worth quite a bit of money. Be aware that all CCGs do not have cards that are valuable, some are more for play value than others. My family plays Magic.
Every member has their own cards.
We enjoy many evenings of spirited play, and spend hours haggling over trades. For us it's a great pastime. The decks are then played against each other, to basically see who is the most clever in combining their cards. Most games or duels as they are referred to are over in ten to fifteen minutes. The play is very quick and there is an element of luck involved.