Quick meaning
The set of colours used consistently throughout an app or website.
Think of it like this
Like the uniform colours of a company — consistent across everything they produce.
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
Colour Scheme means: The set of colours used consistently throughout an app or website.