What does integrated lan mean?

"Integrated LAN " usually means that ethernet is recognized on the motherboard, which means you don't need a plug-in ethernet card. Many all modern computer systems have this. Several have plug-in modems since the majority of emulate a modem with the audio support on the motherboard. You continue to will need a header with the phone jack on the back of the computer. One additional consideration would be built-in wifi support; most laptops have this, but few desktops do.