what is pinned?

i have been here little more than a month, i keep seeing some posts marked as pinned, what is that?

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DrWatson · 70-79, M

If you make a comment on your own post, and then mark it "best comment", it becomes "pinned". this means everyone will see it as the first comment after the post.

Panamared · 70-79, M

@DrWatson thank you