"Descarregar na App Store" is a button that can be found on websites or promotional materials. It is used to direct users to download an app from the App Store, which is the official app store for Apple's iOS operating system. The button typically features the App Store logo and the text "Descarregar na App Store" which means "Download on the App Store" in Portuguese. When a user clicks on the button, they are taken to the App Store website or the app's page within the App Store app where they can download the app to their iOS device.