Hydration plays a vital role in cognitive function, especially in athletes. Even mild dehydration can impair concentration, reaction time, and decision-making. Athletes require optimal hydration to maintain peak performance levels, as water helps facilitate nutrient transport and eliminates waste products. Additionally, hydration affects mood and can alleviate feelings of fatigue, which can distract from performance during training or competition. Therefore, athletes must pay attention to their hydration levels before, during, and after physical activity to support both physical and cognitive performance.