Simplify the following text for a Grade 10 native English-speaking person.
Original: The terms fragrance , scent , and aroma are used primarily by the food and cosmetic industry to describe a pleasant odor , and are sometimes used to refer to perfumes .
Simplified: The words fragrance , scent , or aroma are used mostly by the food and cosmetic industry to describe a pleasant odor , and is sometimes used to refer to perfumes .