Webapp Manifest is the tool that enables visual elements of the app. It gives information and data about the way an app should look on the home screen, on the web, and other mediums. It is used to add themes in terms of colors and gradient, it adds icons for the home screen, and many other visual functions. In other words, Webapp Manifest makes apps look friendlier with themes and icons. It can be installed with the help of a JSON file.