A keyframes rule in CSS is used to create animations. It specifies the animation code and how each style in the animation is applied from the beginning to the end. The animation is created by gradually changing from one set of CSS styles to another. During the animation, styles can be changed many times. These changes are indicated by using percentages (0% represents the start of the animation, 100% the end). You can also use "from" keyword for 0% and "to" keyword for 100%.
In the keyframes rule, you can define these intermediate styles as well as the CSS properties to be animated.
