1.1.4 Abstraction >>> What are abstractions for >>> How Computers Work
By simplifying what a computer does, they make it easier to understand.
There is no single representation, even at the hardware level, because things are represented differently in computer memory, on hard discs and when transmitted over networks (among other things).
Compression algorithms typically work on low-level features like numbers.
You don’t need to understand how each individual image is represented.
There are many different abstractions of a computer; many ways of thinking about them.