What is the difference between “hardsubs” and “softsubs”?
Hardsubs are videos with embeded subtitles. Subtitles are directly encoded onto the video so that they cannot be separated (subtitles become part of the video image). As a result, translations in hardsub files cannot be modified. Softsubs are subtitles that come in a small text file. Special softwares (or players) are required to play these softsubs together with the video. Translations and/or timing can be easily modified in softsubs.