The answer to 'what causes wasp' is that wasps are a type of flying insect that build nests to live and breed in. Wasps are attracted to areas with food sources, like overripe fruit, pet food, or sugary drinks. They are also attracted to certain smells and colors. Wasps build their nests in sheltered areas like under eaves, in attics, or in bushes and trees.
Wasps are often more aggressive than bees and can sting multiple times, which can be dangerous for people with allergies. If you have a wasp nest near your home, it's best to call a professional pest control technician to safely remove it.