What is the file format known as WVTT used for?

The file format known as WVTT, or WebVTT (Web Video Text Tracks), is primarily used for providing captions and subtitles for video content. It is designed to be a simple and easy way to include text tracks, such as subtitles and captions, in HTML5 video elements. The format allows for timed text that syncs with video playback, which enhances accessibility for people who are deaf or hard of hearing, as well as providing translations for viewers who speak different languages. The use of WVTT supports various features, such as styling and positioning, making it a versatile choice for captioning in web applications.

The options relating to storing video content, writing scripts, or editing audio files do not align with the purpose of the WVTT format, which is specifically tailored for captioning purposes within web video.