Understanding Hovering and the :hover Pseudo-Class in CSS

Hovering refers to the state of an element when the user's mouse pointer is positioned over it. When an element is hovered, it is typically highlighted or emphasized in some way to indicate that it is the currently selected or focused element.

In HTML and CSS, you can use the `:hover` pseudo-class to define styles for elements when they are hovered over. For example, you might use the `:hover` pseudo-class to change the background color of an element, add a drop shadow, or modify its text decoration.

Here's an example of how you might use the `:hover` pseudo-class in CSS:
```
#my-element:hover {
background-color: #ff0000; /* red background when hovered */
}
```
This will apply the styles defined in the `:` block to any element with the ID `my-element` when it is hovered over. You can also use the `:hover` pseudo-class on other selectors, such as classes or elements, to apply the styles to specific types of elements when they are hovered over.