Ans :
Internal Modems: Internal Modems plug into expansion slots in your PC. Internal Modems are cheap and efficient. Internal Modems are bus-specific and hence may not fit universally.
External Modems: Modems externally connected to PC through a serial or parallel port and into a telephone line at the other end. They can usually connect ‘ to any computer with the right port and have a range of indicators for troubleshooting.
Pocket Modems: Small external Modems used with notebook P.Cs
PC-Card Modems: PC and Modems are read with PCMCIA slots found in notebooks. They are like external Modems which fit into an internal slot, Thus, they give the advantage of both external and internal modems but are more
expensive,
