Quick meaning
A feature or app that lets you capture what is on your screen and save it as an image.
Think of it like this
Like taking a photograph of whatever is displayed in front of you.
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
Screenshot Tool means: A feature or app that lets you capture what is on your screen and save it as an image.