Magnetic field reversal is not a unique property of the Sun. Tau Boötis A, a star located 51 light-years from Earth, with one exoplanet, has been undergoing magnetic field reversals that have been observed since 2008. Many solar-type stars outside our solar system have shown indirect signs of magnetic activity, suggesting possible reversals. While a few of them have been directly observed, their magnetic field changes include shifting magnetic poles. The magnetic field reversal of Tau Boötis A is interpreted to be driven by the interaction with its exoplanet, Tau Boötis Ab, similar to the interaction between the Sun, Jupiter, and Saturn. For solar-type stars with empirical data, the correlation of star’s magnetic activity cycle to its rotation period is compared with another possible correlation of magnetic activity cycle to the rotation period, radius, and B-field intensity of the star—together.