The Perseid Meteor shower is the result of a debris stream that stretches from the orbit of comet 109P/Swift-Tuttle. The shower appears to eminate from the constellation Perseus, which is where it derives it’s name.
The reason why we see the shower on Earth is because in August of each year, the Earth passes through a cloud of debris left in the wake of the Swift-Tuttle comet. Just to clarify the above answer slightly, it’s not the tail of the comet we’re passing through, but the debris dropped from the comet along it’s (cyclical) 133 year orbit. What we see as the meteor shower is in fact little pieces (many are no bigger than a grain of sand) of millennia-old dust and ice, burning up in the Earth’s atmosphere.
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