A common misconception.
It is where permanent damage will occur when you exceed or reach this value.
Also there are limits on what each pin can cope with depending on the distribution of pins and ports.
Yes but sadly this is not true.
Odd that, it is an attitude we see a lot. "It's OK because it is just for testing"
So who tell the laws of Physics that it is just for testing and to suspend their jurisdiction?
Given the OPs user name
@onlydoingthis_foractivationcode
I sort of think he has no interest in the answers he gets to this thread.