Quick meaning
When an app or operating system stops working suddenly and closes itself.
Think of it like this
Like a car engine stalling unexpectedly in the middle of the road.
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
Crash means: When an app or operating system stops working suddenly and closes itself.