Quick meaning
The amount of time your phone waits before automatically turning off the display to save battery.
Think of it like this
Like lights on a timer that turn off after you leave a room.
Where you may see this
You may hear this when buying a device, asking for repairs, or checking phone and computer settings.
Why it matters
Understanding the hardware term helps you choose the right device and explain problems more clearly when asking for help.
Say it simply
Screen Timeout means: The amount of time your phone waits before automatically turning off the display to save battery.