ExpressCard是一种用来取代Cardbus的硬件标准，是一种信息设备用的扩充接口，它与CardBus一样都是由PCMCIA机构所发展，ExpressCard接口的骨干部分可用USB 2.0或PCI Express等接口与（信息）设备本体相连，至于要使用USB抑或PCI Express接口来相连则由硬件设计师依据应用的需求与场合来决定，同时ExpressCard也与过往的CardBus、PC Card相同，皆具有热插拔的机制功效。

ExpressCard, initially called NEWCARD, is an interface to connect peripheral devices to a computer, usually a laptop computer. The ExpressCard technical standard specifies the design of slots built into the computer and of expansion cards to insert in the slots. The cards contain electronic circuits and sometimes connectors for external devices. The ExpressCard standard replaces the PC Card (also known as PCMCIA) standards.