mp3 and mp4 are two popular formats for audio and video files on the internet. Both of them use compression technology to reduce the file size and make it easier to transfer and store. But what are the differences between them?

mp3 is short for MPEG-1 Audio Layer 3, which is an audio compression technology that was launched in 1994. This technology can remove the audio information that cannot be heard by the human ear, which reduces the file size without noticeable quality loss. mp3 is a common format for downloading and listening to songs, podcasts, and audiobooks, and it can be opened by any audio player on any operating system.

mp4 is short for MPEG-4 Part 14, which is a video compression technology that was launched in 2003. This technology can reduce the quality of both audio and video, while maintaining an acceptable quality. mp4 is a flexible format that supports all kinds of media such as audio, video, subtitles, 2D and 3D graphics. mp4 is a common format for downloading and watching movies, TV shows, and various videos, and it can be opened by most video players on any operating system.