noun

Caffeine is a substance that can be found in certain foods and drinks, like coffee, tea, and chocolate. When people consume caffeine, it can make them feel more awake and alert.

Think of it like a special ingredient that can make you feel more energized, like when you eat a piece of candy and it gives you a burst of energy. But caffeine can also make it harder to fall asleep or stay asleep, so it's important to be careful about how much you have and when you have it.

So, to sum it up: caffeine is a substance that can help you feel more awake and alert, but too much of it can make it hard to sleep.

Example

1. I usually drink coffee in the morning to get my dose of caffeine.
2. My mom says I'm too young to have caffeine, so I can't drink soda.
3. Some people get headaches if they don't have their usual amount of caffeine.