of counterfeit chargers that look like the real thing but are anything but safe on the inside.
And those generic chargers:
often deliver unstable voltage,
can cause overheating,
sometimes even make the phone charge more slowly or unevenly,
and in the worst-case scenario, they can
permanently damage the battery.
I once experienced my phone suddenly flickering while charging—all because of a cheap €3 cable.
Since then, I buy:
original chargers from the manufacturer
or certified brands (e.g., MFi for Apple, QC/PD-certified for Android)
It costs a bit more—but