Operating System (OS)
An Operating System is system software that manages computer hardware and software resources and provides common services for programs.
Functions of OS
- Process Management
- Memory Management
- File System Management
- Device Management
- User Interface (GUI/CLI)
- Security & Error Detection
Types of OS
- Batch OS: Processes jobs in groups
- Time-Sharing OS: Multiple users simultaneously — UNIX
- Real-Time OS: Instant processing — robots, missiles
- Distributed OS: Multiple computers working together
- Mobile OS: Android, iOS
Windows Key Features
- GUI with Desktop, Taskbar, Start Menu
- File Explorer — manage files & folders
- Multi-tasking & Multi-user support
- Control Panel / Settings
Important Shortcut Keys
ShortcutAction
Ctrl+CCopy
Ctrl+VPaste
Ctrl+XCut
Ctrl+ZUndo
Ctrl+SSave
Alt+F4Close Window
Win+DShow Desktop
Win+EFile Explorer