"Secure" means the information is sliced and diced in a way that it can't be reconstructed if somebody happens to intercept it between the web site and your computer.
Let's say somebody sets up a page for you to order their widgets from. And the make it secure. If their logo is sitting on a different, non-secure area, and they put that logo onto the page, the logo itself will not be encoded, even though the rest of the page still will be.
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