Wall Racks
It is raised off the floor, secured to a wall, and supported by brackets, cabinetry, dowels, screws, or columns (Wikipedia). Shelves can be mounted against walls, suspended from ceilings, or part of standalone furniture units, allowing for versatile storage solutions.
Gondola Racks
Gondola racks are free-standing shelves used in retail stores to display products. They are characterized by their metal base, cantilevered shelves, and tall back with hooks or other features for displaying items. Gondola racks are versatile, customizable, and can be used for a variety of retail functions.