Why do some types of cheese have holes

We have often seen several cheese varieties, particularly the Swiss ones with holes. If you remember that cheese which Jerry loves to gorge on, in the famous Tom and Jerry series, you will not fail to remember the holes in it! But why do cheese have holes? The mystery of Swiss cheese and its holes has been solved.

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Why Does Swiss Cheese Have Holes?

Photo Of Different Types Of Cheeses With Holes Over One Another

Figure 7. [Swiss cheese and its characteristic]. - FAQ

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Swiss cheese hole mystery solved: It's all down to dirt - BBC News