What is the difference between the Res and Assets folder in Android

These would be the most notable differences between /resand /assets:

/assets

• Inside this folder, files are added that when the .apk package is generated, keep their name and characteristics.
• Files can be added with capital letters or signs which is not allowed within /res.
• Within this folder you can even create a file structure.

Example:

assets
 |__Directorio
 |__miBasedeDato
 |__ArchivosAndroid

• The R class does not generate ids for elements stored in this folder
• An important difference is that inside /assets elements are added which can be read as a Stream of bytes.

/res

• Contains application resources such as layouts, images (drawables), strings, etc.
• The main difference from /assetsis that these resources are accessed through the R class, which is automatically generated by the project and contains ids that reference each resource within /res.
• Another difference is that within /res, only files with names containing lowercase characters from "a" to "z" and numeric characters from 0 to 9 are allowed.

From experience, in Res go all the Android resources that you can use or create yourself, for example, animations, styles, extra layouts, etc. Already in the folder assetswould go all the extra resources that you can use and that are not from Android, for example sources and multimedia files. In my case, there I have placed videos, ogg files, sources, etc. Even files htmland css.