Final answer:
The VFR hold line (runway hold line) marks the boundary beyond which aircraft must wait for clearance from air traffic control before crossing or entering the runway.
Step-by-step explanation:
The VFR hold line, also known as the runway hold line, marks the boundary beyond which aircraft are not permitted to proceed until authorized by air traffic control. It is a solid, continuous line painted on the pavement at the entrance or exit of a runway.
When pilots approach the VFR hold line, they must stop and wait for clearance to either cross or enter the runway. This ensures that aircraft do not interfere with the landing or departure of other aircraft.
For example, if an aircraft is preparing to take off, it would wait at the VFR hold line until the air traffic controller gives permission to enter the runway and proceed with takeoff.