Please read about it on Wikipedia
https://en.m.wikipedia.org/wiki/Dynamic_dispatch
And for the future to not litter HN with comments like these, next time 10 different people in thread are all explaining to you why you're mistaken, take a moment to try to listen and think through what they're saying instead of just digging deeper.
Having an open mind to learning something new, not just arguing a point is a great approach to life.
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