Components of a computer
Hardware system:
1, input device
2, output device
3, arithmetic unit, controller (central processing unit, cpu)
4. Memory:
(1) Memory: Data loss after power failure, calculation speed is faster than external memory
(2) External memory : Data retention after power failure
Software system:
1. System software :
(1) Desktop operating system (pc-side operating system): Windows (large number of users), macOS (the default system of Apple computers), Linux (less application software, IT practitioners must master it) System)
(2) Mobile system: Android (Android), iOS (Apple)
(3) Server system: Linux (open source, free, stable, very large number of users), Windows server (fee, small number of users)
2 , Application software : except for the operating system software, all are application software (WeChat, qq, games...)