What is the differnece between cartridge and disk video games

Cartridge and disk video games are simply two styles of storing the game (mostly old and new) sort of like floppies verses CDs for computers.

A cartridge is mostly the older way of storing a game for example a lot of the first video games for game systems were on cartridges, which were plastic blocks with the important hardware inside them and one side was open where it was fitted into the system. With cartridge games the saved game data was usually stored on the cartridge it's self. Cartridge games still exist to an extent though they are much smaller for example the game boy SP and advanced games could be considered cartridge games though I am unsure whether DS is quite a cartridge game, older examples are the N64 and most older game systems.

Disk video games are exactly what they sound like the game is stored on a disk (similar to a CD or DVD though usually a different size etc), with disk video games the player's saved data is usually saved on a separate memory card. Disk games are much more common now especially with game systems you hook into the tv as oppose to handhelds, for example Game Cubes, Wiis, Playstations, etc.