扩展卡是用于向设备添加功能的组件。例如显卡可以让电脑在屏幕上显示内容。
Expansion cards can be inserted in the expansion cards slots present in all devices, once added they provide the computer a new component with functions you can access using the Component API
There are 8 types of expansion cards in OpenComputers, Some of them with more than one tier: