+An **expansion card** is a printed circuit board that connects to an [Expansion Slot](/wiki/expansion_slot) on a computer's [Motherboard](/wiki/motherboard). It provides additional functionality, like enhanced graphics or network connectivity, extending the system's capabilities.
+## See also
+- [Graphics Card](/wiki/graphics_card)
+- [Sound Card](/wiki/sound_card)
+- [PCI Express](/wiki/pci_express)
... 1 more lines