Plain English Meaning
Which runway the airport is currently using and which instrument approach is being flown to get to it. Pilots need both pieces of information so they can plan their arrival before talking to controllers.
Full Definition
The specific runway or runways currently active for landing and takeoff at an airport, along with the instrument approach procedures being used to arrive at those runways. This information is broadcast on the ATIS so pilots know which runway to expect and which approach to brief and set up before contacting approach control or tower.
Context Anchor
Heard on ATIS before a pilot contacts approach control, tower, or at a .