“The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.”
There is no better page to explain this amendment, than this one. There are many rights that ‘we, the people’ have that are not explicitly listed in the Constitution, but are a fundamental part of us. This is one of those amendments under the heading of “Just because the ‘right’ isn’t explicitly declared, doesn’t mean it doesn’t exist at all”.
If you look throughout our Constitution (both state and federal), you’ll find that many of the activities, products, and things that we take for granted, are not in there. Does that mean that we shouldn’t be able to enjoy them? That’s where 9A comes in handy; it brings forth the premise of thinking outside the box and not restricting you ONLY to the rights contained within the COTUS.