I sometimes use an offline analogy to explain. Consider the idea of a link being a recommendation.
Now imagine you're having a problem with the pipes in your kitchen. Who would you sooner ask for advice. Your neighbor who happens to be a plumber or a random person walking down the street? If you asked 10 random people walking by and they all advised one solution, while your neighbor the plumber recommended a different solution, who's advice are you going to follow?
The quality of the recommendation is very important. So is the quality of the link.
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