What is an empty tag in HTML?

An empty tag in HTML is an element that does not have any content between an opening tag and a closing tag. Instead, it is self-contained and typically does not require a closing tag. These tags are often used to insert elements that do not have any inner content, such as images or line breaks.

Examples of empty tags include:

1. <img>: Used to embed images.

   <img src="image.jpg" alt="Description of image" />

2. <br>: Inserts a line break.

   <p>This is a paragraph.<br>This is a new line.</p>

3. <hr>: Creates a horizontal rule (line).

   <hr />

4. <input>: Used for form inputs.

   <input type="text" placeholder="Enter text here" />

In HTML5, it is common to use a self-closing syntax (e.g., <img />), but the closing slash is optional, so <img> is also valid.