When you look inside your cabinets, you might see a row of stuff all vying for space on the bottom of the cabinet -- and a vast, empty space above it all.
If organization doesn't come easily to you, it probably never occurred to you that you can actually use that space. You can buy shelving that goes inside cabinets to make the best use of what you have. Think of it as bunk beds for your pots and pans.
Especially if you have tall, narrow cabinets that have never seemed good for anything but cutting boards, this shelving can be a big space saver.