Computer expansion slots are interfaces that allow new hardware devices to plug into a motherboard and be used by a computer in addition to its original hardware.
ISA
Industry Standard Architecture or ISA is an outdated expansion slot technology that was used in many computers in the 1980s and early '90s.
PCI
Peripheral Component Interconnect or PCI is a standard type of expansion slot found in most modern computers (many computers have several PCI slots). PCI can be used to connect hardware, such as network cards, sound cards and modems, to a motherboard.
PCIE
Peripheral Component Interconnect Express or PCIe is a faster version of the PCI expansion bay that is commonly used to connect high-powered video cards.
AGP
Accelerated Graphics Port or AGP is a type of expansion slot used only for graphics display adapters. PCIe has replaced AGP in many new computers.
RAM Slots
Most computers have two to four slots that can house random access memory or RAM modules. These slots are not always considered expansion slots in the true sense because they do not add new functionality to a computer. However, adding more RAM is a common way to speed up a computer.
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