Hotfix rhinestones appliqués and hot fix transfers are decorative embellishments that consist of small rhinestones attached to a heat-activated adhesive. They are commonly used in fashion design, DIY crafting, and accessory customization. To apply hotfix rhinestone appliqués, you typically use a heat source, like a heat press machine or a household iron, to melt the adhesive on the back of the rhinestones and then press them onto the desired surface. These appliqués can add sparkle and glamour to various items such as clothing, accessories, and even home décor items.