What are the expansion slots and adapter cards?

Expansion slots are connectors on a computer's motherboard that allow additional hardware components, known as adapter cards, to be installed. These adapter cards enhance the system's capabilities, enabling features such as improved graphics, sound, or network connectivity. Common types of expansion slots include PCIe (Peripheral Component Interconnect Express), PCI (Peripheral Component Interconnect), and older standards like AGP (Accelerated Graphics Port). By utilizing these slots, users can customize and upgrade their systems based on specific needs and preferences.