Please describe the basic differences between mp3 & mp4 formats ?

Here you go: https://www.askmehelpdesk.com/mp3/difference-between-mp3-mp4-file-format-100615.html
And
https://www.askmehelpdesk.com/other-software/differnce-between-mp3-mp4-14941.html

Of course mp4 is most advance system than mp3

Mp4 is most advance format

MP3

The name of the file extension and also the name of the type of file for MPEG, audio layer 3. Layer 3 is one of three coding schemes (layer 1, layer 2 and layer 3) for the compression of audio signals. Layer 3 uses perceptual audio coding and psychoacoustic compression to remove all superfluous information (more specifically, the redundant and irrelevant parts of a sound signal. The stuff the human ear doesn't hear anyway). It also adds a MDCT (Modified Discrete Cosine Transform) that implements a filter bank, increasing the frequency resolution 18 times higher than that of layer 2.

The result in real terms is layer 3 shrinks the original sound data from a CD (with a bit rate of 1411.2 kilobits per one second of stereo music) by a factor of 12 (down to 112-128kbps) without sacrificing sound quality.


Because MP3 files are small, they can easily be transferred across the Internet.

MPEG -- Stands for "Motion Picture Experts Group". This is the standard for compressing and storing audio and video files on the Internet and transferring them to portable audio/video players.



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MP4

May refer to the MPEG-4 technology in general or to its file structure, which uses the .MP4 extension. MP4 files are container formats that can hold a mix of multimedia objects (audio, video, images, animations, menus, etc.). See MPEG and MP4 player.

So it just takes it one step further

Also I believe MP3 only does Music but MP4 Does (audio, video, images, animations, menus, etc.).

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