For any production web application targeting mobile users, generating a well-optimized, properly masked icon-192x192.png should be a non-negotiable step in the build process.
The file icon-192x192.png refers to a square image with dimensions of 192 pixels by 192 pixels. It is most commonly referenced within the manifest.json file—a JSON file that tells the browser how a web app should behave when "installed" on a user's device. icon-192x192.png