Caffeinated beverages are drinks that contain caffeine, a natural stimulant that can enhance alertness and reduce fatigue. Common examples include coffee, tea, and energy drinks. The caffeine content varies widely among these beverages, with coffee typically having the highest levels. Many people consume caffeinated beverages for their stimulating effects, which can improve concentration and mood. However, excessive intake may lead to side effects such as insomnia, increased heart rate, and anxiety. It's important to enjoy these drinks in moderation to avoid potential health issues.