What Do You Use A Fogger For?

I have recently seen a pest control company in the neighborhood who has been spraying their customers houses and yards. What caught my attention is the amount of off spray that I see that the backpack fogger they are using is spraying out. I am particularly concerned because my cat is an outside cat and I do not want it to get sick from the spray. What types of things do people and companies use with the fogger. Is there anyway that it could be harmful if ingested? What if my kids play in the grass after it is sprayed? Could they be bringing in harmful materials?

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