The use of abstractions is one of the most important concepts in computer science.
Foe example:
- API(application program interface): a set of functions that allow programmers to use the code without having to delve into its inner workings. Such as Java class and C function prototypes.
- abstractions in computer systems: 1. instruction set architecture provides an abstraction of the actual processor hardware, with this abstraction, a machine-code program behaves as if it were executed on a processor that performs just one instruction at a time. 2. files as an abstraction of I/O devices; 3. virtual memory as an abstraction of program memory; 4. virtual machine providing an abstraction of the entire computer, including the operating system, the processor, and the programs.
