The de-facto standard to interface Personal Computers with Smart Cards (and smartcard readers of course). SpringCard PC/SC Readers comply with this standard. This makes those products usable on most operating systems, using an high-level and standardized API.
Europay - Mastercard - Visa. The specifications and the certification process dedicated to the smartcards (and readers) used in banking applications.
reader (Microprocessor-based card)
An ICC (or a PICC) whose chip is a small computer. This is the case of high-end cards used in payment, transport, eID/passports, access control... Key features are security, ability to store a large amount of data and to run an application inside the chip. Most of the time they implement the command set defined by ISO 7816-4.
Coupling device or coupler. A device able to communicate with an ICC. This is what everybody calls a smartcard reader. Technically speaking it could be seen as a gateway between the computer and the card.
Integrated-circuit card. This is the standard name for a plastic card holding a silicon chip (an integrated circuit) compliant with the ISO 7816 standards. A common name is smartcard.