Types of Files in Mobile Explained (JSON, ICO, TMP, etc.)

Published by munipalli akshay paul @

📂 Types of Files in Mobile Explained (JSON, ICO, TMP, APK & More)

When you open your mobile file manager, you may see many different file types like:

  • .json

  • .ico

  • .tmp

  • .apk

  • .nomedia

  • .log

You might wonder:

What are these files? Are they important? Can we delete them?

Let’s explain each file type in simple language.

📄 1️⃣ JSON Files (.json)

JSON stands for JavaScript Object Notation.

These files:

  • Store structured data

  • Used by apps to save settings

  • Used in web apps and APIs

Example:
Apps store configuration or user data in JSON format.

👉 Usually safe to keep.
⚠ Do not delete if inside app folders.

🖼 2️⃣ ICO Files (.ico)

ICO files are:

  • Icon image files

  • Used for app icons or shortcuts

They are small image files that represent apps.

👉 Safe to delete only if not linked to any app.

🗑 3️⃣ TMP Files (.tmp)

TMP means Temporary File.

These files:

  • Created temporarily by apps

  • Used during downloads or updates

  • Deleted automatically in many cases

👉 Usually safe to delete.

(We discussed temporary files earlier — they are not important system files.)

📦 4️⃣ APK Files (.apk)

APK stands for Android Package Kit.

It is:

  • The installer file for Android apps

  • Like .exe file in Windows

When you download an app outside Google Play Store, it comes as an APK file.

👉 Safe to delete after installation.
⚠ Be careful — APK files from unknown sources may contain viruses.

🚫 5️⃣ NOMEDIA Files (.nomedia)

NOMEDIA files:

  • Tell the system not to show media in gallery

  • Hide images or videos from gallery apps

👉 Do not delete unless you want hidden files to appear.

🧾 6️⃣ LOG Files (.log)

Log files:

  • Record app activity

  • Used for debugging errors

Developers use them to fix problems.

👉 Safe to delete if very large and old.

🎵 7️⃣ Media Files

Common types:

  • .jpg / .png → Images

  • .mp4 → Videos

  • .mp3 → Audio

  • .pdf → Documents

These are your personal files.

⚠ Delete only if not needed.

⚙ 8️⃣ OBB Files (.obb)

OBB files:

  • Used by large games

  • Store extra game data

Example:
Big games download OBB files separately.

👉 Do not delete if you still play the game.

🧠 9️⃣ CACHE Files

Cache files:

  • Store temporary data

  • Help apps load faster

You can clear cache safely from Settings.

📊 Quick Summary Table

File TypePurposeSafe to Delete?
.jsonApp data❌ Usually No
.icoIcon file⚠ Sometimes
.tmpTemporary file✅ Yes
.apkApp installer✅ After install
.nomediaHide media⚠ Be careful
.logError record✅ Usually
.obbGame data❌ If game installed

⚠ Important Tips

✔ Do not delete system folders
✔ Avoid deleting unknown files inside Android folder
✔ Use built-in cleaner tools
✔ Backup important data before mass deletion

❓ Frequently Asked Questions

Q1: Can deleting random files damage my phone?

Yes, if you delete important system files.

Q2: How to safely clean storage?

Use built-in cleaner or Files by Google app.

Q3: Why do so many unknown files appear?

Apps create data files automatically.

📝 Conclusion

Your mobile contains many file types for apps, system functions, and storage.
Some files like TMP and LOG are safe to delete, but others like JSON and OBB are important for apps.

Always check before deleting unknown files.

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