Who would use mp3 and mp4?

MP3 files are commonly used by music listeners and content creators for audio playback, as they compress music without significantly sacrificing quality, making them ideal for portable devices. MP4 files, on the other hand, are widely used for video content, including movies, online videos, and presentations, due to their ability to store high-quality video and audio together in a single file. Both formats are popular among casual users and professionals alike for their versatility and compatibility across various platforms.