Comet Swift–Tuttle has an orbit of approximately 133 years, and its debris creates the Perseid meteor shower.
As the comet travels around the Sun, it releases dust and rocky particles. Those particles remain distributed along its orbital path. Earth’s yearly passage through that debris stream causes the particles to enter the atmosphere and produce Perseid meteors.
An orbital period of 133 years means the comet itself is not near the Sun every year. The annual shower is caused by Earth crossing the long-lived debris trail, not by a fresh comet visit each August.
This distinction is one of the most useful ways to understand meteor showers. The parent comet may take more than a century to complete an orbit, while Earth encounters the stream on a yearly schedule. The Perseids therefore recur annually even though Swift–Tuttle’s own returns are far less frequent.