What is mildew and is it different than mold?

“What is mildew?” The answer depends on whether you ask a scientist or a nonexpert. Mycologists, who study fungi, use the term “mildew” only for fungi that grow on plants. When mycologists say “Mildew,” they mean the white growth that causes diseases in plants.
People who are not scientists use the term “mildew” differently. For them, mildew is the discoloration caused by mold in buildings. The molds that grow around windows or in bathrooms are called “mildew.” Is mildew different than mold? The mycologist would say they are different. Mildew only grows on plants outdoors. The nonexpert, however, sees the effects of mold growing indoors and calls it “mildew.”