Flexbox simplifies creating flexible, responsive layouts. It enables developers to align and distribute space among items in a container, regardless of their size. This feature is incredibly useful for building dynamic layouts, making elements automatically adjust to different screen sizes.
CSS Grid is a powerful 2-dimensional layout system that allows for precise control over both rows and columns. It simplifies complex layouts that previously required workarounds like floating or positioning.
CSS3 introduced transitions and animations, allowing smooth changes in style properties and enabling more dynamic, interactive user experiences without JavaScript. These features enhance visual feedback with effects like hover animations, sliding, and fading.