[hnarn]

> A keyboard being hot-swappable means the PCB (which, simply put, is the circuit board inside the keyboard) has special sockets so that you can click switches into place and pull them out without ever needing to touch a soldering gun.

From a Google search :-)

[Nightshaxx]

This is acctually becoming a more common feature. I recently purchased a new mechanical keyboard and a lot of the newer designs are host swappable.