Beer is made of water, hops (a type of flower), barley (a grain), and yeast (the same tiny creatures that help bread to rise).
The barley is full of sugar, which is food for the yeast. You smash the barley up and soak it in water to get the sugar out. Then you strain the water to make a soupy sugar mixture called wort.
You then boil the wort to kill any bacteria and wild yeast that might be living in it. You add hops during the boiling process for flavor.
Then when it cools down, you toss in the yeast!
The yeast eats sugar and poops alcohol and burps carbon dioxide (bubbles). After a week or two of waiting the yeast eats up as much sugar as it can and then dies or goes to sleep because it made too much alcohol.
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