In computer terminology, Hot-Swapping refers to being able to disconnect and remove hardware, as well as installing and connecting hardware, without turning off a computer.
Generally, this is a dumb idea, since most operating systems and most hardware aren’t prepared for you to do that.
In fact, a lot of internal hardware (drives and memory, for example) can fry if you connect them while your computer is powered. PS2 ports for keyboard and mouse are also subject to frying themselves — the motherboard connector, not the frying the cheap keyboard or mouse — if you unplug or plug a device into a PS2 port. Of course, new computers today seldomly have PS2 ports, but those from recent years have them.
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Many new devices use USB connections to connect to the computer. Examples of devices using USB connectors today are keyboards, mice, scanners, flash drives, cameras, some network adapters, and even more items.
Although hot-swapping is billed as one of the big advantages of USB, the devices are not all “hot swappable.
Read more in Hot-Swapping USB Devices
