Saturation means the state of being completely filled or soaked, with no room for more. When a sponge reaches saturation, it can't absorb another drop of water. When soil reaches saturation after heavy rain, puddles form because the ground simply can't hold any more moisture.

The word appears in many contexts. In chemistry, a saturated solution contains as much dissolved substance as possible: if you keep stirring sugar into water, eventually the water reaches saturation and extra sugar settles at the bottom. In art and design, color saturation describes how intense or vivid a color appears. A highly saturated red looks bold and bright, while a less saturated red looks washed out or grayish.

You might hear about market saturation when so many companies sell the same product that customers have more choices than they need. Or media saturation, when news about one topic fills every channel and website until people feel overwhelmed.

The related verb saturate means to soak something completely or fill it beyond capacity. After you saturate a paper towel with juice, it drips everywhere. The core idea stays the same: something has absorbed or contains as much as it possibly can.