What is a pinned post, the use of mark?

I see that a post 1 month old has been pinned by paul, what does it mean ? I don’t understand the use of flag, dismiss .
Sorry if I sound stupid

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Hi @Provence, not stupid at all.

When a post is “pinned” it stays at the top of the page, it’s usually a directive, important message or information everyone needs to see … if you are familiar with Social Media you can pin a post to the top of a news feed on Facebook so it doesn’t get “lost” further down the page