Glitter refers to the quality that some materials have to shine with brief sparks or bright flashes of reflected light.
Rhinestones and sequins are examples of shiny, decorative adornments that glitter and are generally used to enhance the appearance of evening footwear or clothing.
About Slingbacks:
Slingbacks are a type in shoe in which the heel is exposed yet is contained or secured by a strap that sits above the heel around the ankle.