1. MP4 (MPEG-4 Part 14)

• Most common video format used today.
• Works on almost all devices (PC, Mac, smartphones, smart TVs).
• Supports high-quality video and audio while keeping file sizes small.
• Great for streaming and online sharing (e.g., YouTube, Facebook).

2. 3GP (3GPP)

• Designed for old mobile phones (3G networks).
• Very small file sizes but low video quality.
• Rarely used today because smartphones now support better formats like MP4.

3. AVI (Audio Video Interleave)

• Created by Microsoft in the 1990s.
• Can store high-quality video, but file sizes are large.
• Doesn’t support modern compression, so it's not ideal for streaming.
• Works well on Windows devices, but might need extra software on Mac.

4. MOV (Apple QuickTime Movie)

• Developed by Apple for Macs and iPhones (but can also work on Windows).
• Supports high-quality video and audio.
• Similar to MP4, but sometimes larger in file size.
• Best for video editing because it's designed for QuickTime.

5. MKV (Matroska Video)

• Best for high-quality videos, including 4K movies.
• Supports multiple audio tracks, subtitles, and extra data (great for Blu-ray rips).
• Not always supported on TVs or mobile devices without special software.
• Often used for storing and sharing movies.

Which one should you use?

• For general use (YouTube, phones, social media): MP4 ✅
• For very small file sizes (old phones): 3GP ❌ (outdated)
• For Windows users (high-quality, older format): AVI 🟡 (big files)
• For Apple users (Mac, iPhone, editing): MOV ✅
• For high-quality movies (Blu-ray, 4K, multiple subtitles): MKV ✅