Marketing: what is the difference between a "claim", "post" and "copy"?

Hi there, I got a task at my job to come up with claims, posts and copy to be used on billboards, banners and teaser, and I was wondering what are the

Hi there, I got a task at my job to come up with claims, posts and copy to be used on billboards, banners and teaser, and I was wondering what are the main differences between these three categories? I would love to see some examples.

or:Hi there, I got a task at my job to come up with claims, posts and copy to be used on billboards, banners and teaser, and I was wondering what are the main differences between these three categories? I would love to see some examples.

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