Quick meaning
The original settings a device came with when it was made, before any personalisation.
Think of it like this
Like returning a rental car exactly as you received it — no personal adjustments left behind.
Where you may see this
You may see this inside app stores, app settings, software updates, and install instructions.
Why it matters
Knowing the term helps you understand what an app is asking you to do before you tap, install, or change anything.
Say it simply
Factory Default Settings means: The original settings a device came with when it was made, before any personalisation.