The common laptop connection is a PS/2 connector - but not all laptops have them. Check in your manual. Unfortunately they look similar to some other connectors, so a description is not a good idea.
Otherwise you may have to use a USB connection.
A crdless keyboard simply works by wireless. The keyboard itself has no cable - just a transceiver. The other half of the system - another transceiver, plugs into the keyboard connector on the laptop.
An internet keyboard, and/or multimedia keboard has extra keys for internet/multimedia purpose - such as a "connect to web" key, and a "Volume Control" key - usually quite a few of them
A corede keyboard may be either normal, or Internet/multimedia - as may a cordless one.