vtt

VTT commonly refers to WebVTT, a W3C standard for text tracks in web video, but it is also used as an abbreviation for Virtual Tabletop in online tabletop gaming.

WebVTT is a plain-text format with the .vtt extension. A WebVTT file starts with the header WEBVTT and contains cue blocks that specify a start time, end time, and the text to display. It can also include optional cue settings such as line, position, align, and size, as well as metadata. The format is designed to be human-readable and easy to author.

In web video, WebVTT files provide subtitles, captions, descriptions, and chapter markers. They are loaded with the HTML5 video track element and are supported by most major browsers. WebVTT can be delivered alongside the video or served via HTTP, and it integrates with streaming setups as well as local playback.

Virtual Tabletop refers to software platforms that host online tabletop role-playing games. VTTs provide maps or grids, tokens, dice rollers, character sheets, and chat to enable collaborative play. Popular examples include Foundry VTT and Roll20. These applications focus on enabling interactive gameplay, character management, and shared environments for remote groups.

In sum, VTT can denote a technical text format for media accessibility (WebVTT) or a category of online gaming software (Virtual Tabletop). The two uses share an acronym but serve very different purposes.