Quick meaning
Whether two pieces of software or hardware work correctly together.
Think of it like this
Like checking if a new plug fits the socket before buying an appliance.
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
Compatibility means: Whether two pieces of software or hardware work correctly together.