The <video> tag in HTML is used to embed video files or streams into a web page. It allows you to play videos directly in the browser without the need for third-party plugins. 
Here is a basic example of how the <video> tag can be used:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>HTML Video Tag Example</title>
</head>
<body>

    <h2>Video Example</h2>

    <video width="640" height="360" controls>
        <source src="example.mp4" type="video/mp4">
        Your browser does not support the video tag.
    </video>

</body>
</html>

In this example:

  • The <video> tag is used to define a video player.
  • The width and height attributes set the dimensions of the video player.
  • The controls attribute adds playback controls (play, pause, volume, etc.) to the video player.
  • The <source> tag is used to specify the video file and its type. In this case, it's an MP4 video file.

The text "Your browser does not support the video tag." is displayed if the browser does not support the video tag or if the specified video format is not supported.

You would replace "example.mp4" with the actual path to your video file. Additionally, you might want to provide multiple <source> elements with different video formats (e.g., WebM, Ogg) to ensure compatibility with various browsers.