A VTT file, also known as WebVTT or a "Web Video Text Track" file, is a commonly used caption and subtitle format with the .vtt extension. It is a text file saved in the Web Video Text Tracks (WebVTT) format, which contains supplementary information about a web video, including subtitles, captions, descriptions, chapters, and metadata. VTT files do not contain any video data. The WebVTT format is designed to provide chapters for content navigation, text video descriptions, and other metadata aligned with audio or video content. VTT files are compatible with most major media hosting platforms and can be used to caption or subtitle videos on platforms like YouTube, Vimeo, and VideoLAN VLC Media Player. VTT files can be opened and edited using any text editor, such as Microsoft Notepad (Windows), Apple TextEdit (Mac), or GitHub Atom (multiplatform). To use a VTT file as a subtitle track in VideoLAN VLC Media Player, you can begin playing the video you want to use your VTT file with, select Subtitles → Add Subtitle File from the VLC Media Player menu bar, navigate to the folder containing your VTT file, select the file, and then select Open.