Plug and Play is the set of mechanisms by which Windows detects hardware, identifies it, assigns resources and selects a driver automatically, without the user configuring addresses or settings manually.
In practice
Connect a USB keyboard and, within moments, Windows has noticed the new device, read its identifiers, chosen the keyboard class driver and made it usable. Remove it and Windows tidies up just as automatically, keeping the instance remembered for next time.
Common confusion
Plug and Play does not mean every device works fully with no maker software, nor that hot-plugging is safe for every device type. Internal cards generally still require the computer to be off. It describes detection and configuration, not universal compatibility.
Why it matters to readers
Most entries in a device's event history are Plug and Play milestones. Understanding the process helps you read those entries and recognise where in the sequence a device stopped.
A closer look
Plug and Play also covers power and removal events. When you choose to safely eject a drive, Windows asks each driver in the stack whether removal can proceed, giving them a chance to finish writing data. When a device is unplugged unexpectedly, the same machinery notifies drivers so they can release resources. These conversations happen silently in the background.
