Software & Operating Systems
🔒 Log in to trackTypes of software: system, application, utility
🔒 Log in to track| Class | What it does | Examples |
|---|---|---|
| System software | Runs/manages the machine itself | Operating systems (Windows, Linux, macOS, Android), device drivers, firmware/BIOS |
| Utility software | Maintains, protects, optimises | Antivirus, disk defragmenter, disk cleanup, backup tools, compressors (WinZip/7-Zip), file manager |
| Application software | User tasks | General purpose: MS Office, browsers, media players; Custom/application-specific: payroll system, railway reservation |
Licence classes: Freeware (free to use, source closed - Adobe Reader), Shareware (free trial, pay later - WinZip), Open source (source code available - Linux, LibreOffice, Firefox), Proprietary (paid licence - MS Office). Firmware is software burned into hardware (BIOS chip).
Detailed notes
The three classes of software
Every program on earth falls into one of three boxes. Ask one question: who is the program serving?
| Class | Serves | Examples |
|---|---|---|
| System software | The machine itself — runs and manages the hardware | Operating systems (Windows, Linux, macOS, Android), device drivers, firmware/BIOS, language translators (compiler, interpreter, assembler) |
| Utility software | Maintenance of the machine — clean, protect, repair, organise | Antivirus, disk defragmenter, disk cleanup, backup tools, file compressors (WinZip, 7-Zip, WinRAR), file manager, screen saver |
| Application software | The user's task | MS Word, Excel, PowerPoint, browsers (Chrome), Photoshop, games, WhatsApp, Tally |
Memory test — the SUApp test: does it Serve the machine (system), Unclog it (utility), or do the user's App work (application)?
Two boundary points exams love:
- A device driver is system software, even though you install it like an app — it teaches the OS to talk to one piece of hardware (printer, graphics card).
- A utility keeps the machine healthy but does not produce user documents; an application produces the user's output.
Utility software — the maintenance crew
| Utility | Job |
|---|---|
| Antivirus | Finds and removes malware |
| Disk Defragmenter | Rejoins scattered pieces of files on a hard disk so reading is faster |
| Disk Cleanup | Deletes temporary and junk files to free space |
| Backup utility | Keeps a second copy of important data |
| Compression tool (WinZip, 7-Zip) | Shrinks files into smaller .zip archives and opens them |
| File manager | Copies, moves, renames and organises files |
Licence types (one-mark favourites)
| Type | Meaning | Example |
|---|---|---|
| Freeware | Free of cost, but source code stays closed | Adobe Reader |
| Shareware | Free trial for a limited time or features, then pay | Trial antivirus |
| Open source | Source code is available; free to use and modify | Linux, LibreOffice, VLC |
| Proprietary | Paid licence, closed source | Windows, MS Office |
Trap: freeware is free of cost but not open source — the two ideas are different.
Quick revision
- System = machine (OS, drivers, BIOS, translators); Utility = maintenance (antivirus, defrag, cleanup, backup, zip); Application = user's task (Word, Chrome, games).
- Drivers and firmware are system software, not applications.
- Freeware = free cost, closed source. Open source = source available (Linux, VLC).
- Shareware = try first, pay later.
Types of questions asked
Every way this subtopic shows up in exams — how to recognise it, the formula or logic to use, and a solved example.
Type 1: System vs application vs utility classificationvery common3 practice Q
A program is named (Word, antivirus, driver, Windows, Photoshop) and its class is asked, or a list is given with 'which is not like the others'.
- Apply the SUApp test: serves the machine = system; maintains it = utility; does the user's task = application.
- Drivers, BIOS/firmware and translators are system software — the classic traps that look like apps.
- In odd-one-out, find the one program that serves a different master (three applications + one OS, or three utilities + one game).
Example: Which of the following is application software?
MS Word — it does the user's task (documents). Windows is an OS, a driver serves hardware, antivirus is a utility.
Type 2: Utility identification by jobvery common4 practice Q
A maintenance job is described — rearranging scattered files, removing malware, shrinking files, freeing disk space, keeping a second copy — and the utility is asked.
- Match job to crew member: scattered-file pieces → Defragmenter; junk/temporary files → Disk Cleanup; malware → Antivirus; second copy → Backup; smaller archive → Zip/7-Zip.
- 'Faster disk reading' on a hard disk points to defragmentation, not formatting.
- Freeing space = cleanup; speeding up access = defragmenter.
Example: Which utility joins the scattered pieces of a file spread across a hard disk so it opens faster?
Disk Defragmenter — it rearranges fragments into contiguous blocks. Disk Cleanup only deletes junk; it does not rearrange anything.
Type 3: Licence types: freeware / shareware / open source / proprietarycommon2 practice Q
'Linux is which type of software?', 'software free for a trial period is called', 'freeware vs open source' statements.
- Four boxes: freeware = free cost + closed source; shareware = trial then pay; open source = source available (Linux, VLC); proprietary = paid + closed (Windows, MS Office).
- The standard trap: 'freeware is open source' — false, cost and source are different things.
- Linux is the default open-source example in every exam.
Example: Linux is distributed as —
Free and open-source software — its source code is public and can be used, modified and redistributed under its licence.
Type 4: Odd one out: which is / is not an operating systemcommon2 practice Q
A list mixes operating systems (Windows, Linux, macOS, Android) with applications and browsers; the odd one is asked.
- Know the OS list cold: Windows, Linux, macOS, Android, iOS, Unix, Chrome OS.
- Everything else famous — Word, Chrome, Firefox, Photoshop, WhatsApp — is an application, not an OS.
- For 'mismatched pair' versions, test each pair: is the left item really the right kind of thing?
Example: Which pair is mismatched?
Firefox – operating system — Firefox is a web browser. Linux, Android and macOS are all genuine operating systems.
Shortcut tricks
⚡ SUApp test
Ask: does it Serve the machine (system), Unclog/maintain it (utility), or do the user's App-job (application)? Windows = system, antivirus = utility, Excel = application.
Example: Disk Defragmenter is which type?
Utility software - it maintains disk performance.
⚡ Licence 4-word key
Freeware = Free forever (closed source); Shareware = Sample first (trial); Open source = Open code; Proprietary = Pay.
Example: Linux is?
Open-source software.
Where students lose marks
Counting device drivers as application software - they are system software.
Calling antivirus an operating system - it is a utility.
Assuming freeware is open source - freeware is free of cost but source stays closed.
Practice sets — 13 questions
Sets of 10, mixed across the question types above. Each answer comes with a step-by-step explanation.
Topic test · 13 questions
Suggested time 5 min · wrong answers go to your mistake notebook automatically.