Water becomes vapor when it gets hot, and there is water in the air. It tries to expand and escape but is trapped by the glass of the oven, and it collects on the glass which is cooled by the outside air. It is also possible that some of the food you cooked previously let off some water vapor that got caught inside the oven. This causes the water to condense and form drops. You see the same thing when the glass walls of a shower get drops from the steam of a hot shower. Also, you’re not stupid. Curiosity is a sign of intelligence, and were all doing our best to learn.
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