What advantage do expresscard modules and u. s.b adapters offer over expansion cards?

The advantage does of ExpressCard modules and U.S.B adapters offer over expansion cards is that it can connect a variety of devices to a computer. The technical standard of ExpressCard specifies the design of slots built into the computer and of expansion of cards to insert in the slots including the mobile broadband modems. It is sometimes connectors for externals devices such as flash drives, USB connectors and other ports that need to connect to the computer.