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An expansion card plugs into an expansion slot on a computer motherboard to provide additional functionality. Expansion slots include PCI, AGP, AMR, CNR, ISA, EISA, and VESA, which can accommodate different types of expansion cards like sound cards, video cards, network cards, and storage cards to upgrade system features. Common expansion cards add capabilities like improved graphics, additional USB ports, network connectivity, and TV tuner functionality. - Download as a PDF or view online for free

One edge of the expansion card holds the contacts (the edge connector or pin header) that fit into the slot. They establish the electrical contact between the electronics on the card and on the motherboard.

In the past, all phones had physical SIM cards that fit into a slot in your device.