HTML attributes provide additional information about HTML elements. They are always included in the opening tag of an HTML element and are used to modify the default behavior or provide extra details about the element. Here are some common HTML attributes:

1.  id: Specifies a unique identifier for an HTML element.

<div id="uniqueID">This is a div with an ID.</div>

2. class: Specifies one or more class names for an HTML element. Used for styling with CSS or JavaScript selection.

<p class="important-text">This is an important paragraph.</p>

3.  style: Defines inline CSS styles for an HTML element.

<span style="color: red; font-weight: bold;">This text is styled inline.</span>

4.  src: Specifies the source URL for external resources like images or scripts.

<img src="image.jpg" alt="An example image">

5. alt: Provides alternative text for images, displayed if the image cannot be loaded or for accessibility.

<img src="avatar.jpg" alt="User Avatar">

6.  href: Specifies the URL of a linked resource, often used with anchor (<a>) tags.

<a href="https://www.example.com">Visit Example.com</a>

7. target: Specifies where to open a linked document, commonly used with anchor (<a>) tags.

<a href="https://www.example.com" target="_blank">Open in New Tab</a>

8. width and height: Specifies the width and height of some elements, like images or table cells.

<img src="image.jpg" alt="Description" width="300" height="200">

9. disabled: Disables user interaction with the element.

<button disabled>Click me</button>

10. placeholder: Provides a hint or example text for form input fields.

<input type="text" placeholder="Enter your name">

These are just a few examples, and there are many more attributes in HTML, each serving a specific purpose for different elements and functionalities.