What does 120 Hz, 90 Hz or 60 Hz mean on cell phones?

When we want to buy a new Android phone or an iPhone, we almost always look only at the number of cameras that the smartphone may have or the battery capacity, leaving important features aside. One of these that is little known, but very relevant is the one that indicates that the mobile It has a screen of 120Hz, 90Hz or 60Hz. What do these combination of letters and numbers mean, and why do I need to know? Here we detail it.

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