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Wasps eats insects, arachnids (like spiders), and sweet nectar. This wasp below is eating a spider, and you can see the legs of the spider hanging out of its mouth.
Many wasps are parasitic. This means that they lay their eggs in a live caterpillar or in beetle grubs. As the eggs develop into the next stage, they eat the poor old caterpillar from the inside out.
This photo is actually of a hornet (related to the wasp), and it is eating ham from the photographer's sandwich! It is cutting off small pieces of ham, and then flying away with them.