A memory card is something that you put in the playstation 2 in order to save games. Newer playstation devices might have a memory card too. You play the
game and you save it. When the memory card gets full, you either have to buy a new memory card or delete some games on the memory card. You save your progress so that you
don't have to play the
game since the beginning and can instead play from where you left off. Good games for the
PS2 are the Spyro series, the Crash Bandicoot series, the Jak and Daxter trilogy, Pacman
world 2, Namco Museum, Mortal Kombat, grand theft auto, and more.