An Operating System (OS) is system software that acts as an interface between the user and computer hardware.
Main functions:
Examples: Windows, Linux, macOS, Android.
Key parts:
Basic actions:
File naming rules (practical):
Sales_Report_Jan_2026.xlsx)* ? < > |File Explorer helps manage files and folders.
Useful features:
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An Operating System (OS) is system software that acts as an interface between the user and computer hardware.
Main functions:
Examples: Windows, Linux, macOS, Android.
Key parts:
Basic actions:
File naming rules (practical):
Sales_Report_Jan_2026.xlsx)* ? < > |File Explorer helps manage files and folders.
Useful features:
Common operations:
Exam note: Copy keeps original; move changes location.
File extension shows file type:
.docx (Word), .xlsx (Excel), .pptx (PowerPoint).pdf (Portable Document Format).jpg/.png (images).mp3 (audio)Why extensions matter:
Good practice:
Backup means keeping a copy of important data to prevent loss.
Why backup is needed:
Simple backup methods:
Common Windows shortcuts:
Productivity tips:
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From this topic
Copy creates duplicate and keeps original at same location; move changes location of original file. Copy uses Ctrl+C then Ctrl+V; move uses Ctrl+X then Ctrl+V. Copy increases storage use; move does not create an extra copy.
Process management, memory management, file management, device management, security and user interface are OS functions (any three).
An operating system (OS) is system software that acts as an interface between user and hardware.
Functions of OS:
Without an OS, a computer cannot be used easily for business tasks like document creation, file storage and printing.