What is the purpose of shine layer on Asset Store template icon?

What is the purpose of shine layer on Asset Store template icon?

The layers of big and small templates are thoroughly explained, but I couldn’t find an info on icon.

Possibly some of you have already made submissions and know.

As the layer is named: “shine (optional)”. You can choose to use it or not. It makes a shiny look if you use it, like the similarly optional shine on iOS icons.