Today we learned about videocards and soundcards. Well each does what they say : soundcards handle sound signals and video cards handle video signals . The major videocard companies are ATI and Nvidia. THe soundcard connects to a pci port and the video cards connect to AGp or "pci express " ports . Modems use the phone lines to transfer internet signals and also connect to the pci ports or they might be external .THe external ones use a diff. technology but have the same effect