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VTT — WebVTT Subtitle
VTT (WebVTT) is the subtitle format of the web: the only one the HTML5 video player reads, used by YouTube, Vimeo and online courses.
WebVTT is a W3C standard from 2010, built on SRT. A VTT file starts with the word WEBVTT and uses a dot before the milliseconds (00:01:05.500). It can also position text on the screen and carry notes and chapter titles.
Many desktop players, TV boxes and video editors still expect SRT, and downloaded VTT captions often have to be turned into SRT before they can be loaded next to a film. Converting back and forth keeps the text and the timing.