HTML styles refer to the visual presentation of HTML elements on a web page. HTML styles can be applied using various methods, including:

1. _Inline Styles_: Using the `style` attribute directly in the HTML element.
Example: `<p style="color: blue;">This text is blue.</p>`
2. _Internal Stylesheet_: Using the `<style>` element in the HTML document's head section.
Example: `<style>p { color: blue; }</style>`
3. _External Stylesheet_: Linking an external CSS file using the `<link>` element.
Example: `<link rel="stylesheet" type="text/css" href="style.css">`
4. _CSS Classes_: Applying pre-defined classes to HTML elements.
Example: `<p class="blue-text">This text is blue.</p>`
5. _CSS IDs_: Applying unique IDs to HTML elements.
Example: `<p id="blue-text">This text is blue.</p>`

HTML styles can control various aspects of element presentation, including:

- Color
- Font
- Size
- Background
- Border
- Padding
- Margin
- Text alignment
- And many more!

Some common HTML styles include:

- `color`: Sets the text color
- `background-color`: Sets the background color
- `font-size`: Sets the font size
- `font-family`: Sets the font family
- `text-align`: Sets the text alignment
- `padding`: Sets the padding
- `margin`: Sets the margin
- `border`: Sets the border

Remember, HTML styles can be combined and reused to create a visually appealing and consistent design across your web page!