The computer system involves two parts:

1. Hardware: machine itself
   1. Input Device: keyboard, mouse, bar code reader
   2. CPU: central process unit
   3. Storage:
      • Primary storage: memory
      • Secondary Storage: hard drive, USB flash drive
   4. Output Device
2. Software: statments telling computers what to do
   1. Operating System: windows 10, macOS, Apple iOS, Android OS, Linus OS...etc.
   2. Application Software: Microsoft Word, Excel, PowerPoint...etc.