Today's fact: App icons are usually made using PNG images because PNG supports transparent backgrounds and keeps the icon sharp without losing quality.

However, modern Android apps don’t always use a single PNG file. Many use adaptive icons, where the icon is built from separate foreground and background layers using XML. Some icons are also made with vector graphics, which can scale to different screen sizes without becoming blurry.

So, while PNG is still widely used for app icons, modern Android icons can also be created using XML and vector graphics.