What is the purpose of express card slot in my laptop?

setup Sophos XG Home edition on an old IBM ThinkPad T510 i5 8GB RAM laptop It only has one NIC but does have an ExpressCard34 slot I need

Suitable for notebook computer , It supports express card slot,not support Pcmcia slot Suitable

vegas slot tournaments The PCAN-ExpressCard provides a connection between a CAN bus and a laptop or desktop PC with an ExpressCard slot The card is available in single and

spinata grande slot 34mm card feels loose in the express card slot · Use left side of the slot or 34mm card adapter