A web application manifest is a standardized JSON file that is used when installing a PWA - progressive web application on a user's device. It’s responsible for providing a “native-like” view of the application for users. Let’s see how to create one for your app.

The Essentials of a Web App Manifest
A manifest enables the user to add the PWA icon to the desktop of their mobile device. This is what makes PWAs so convenient in the first place. There is no need to either search for the needed web page or download and install a full-fledged mobile application while you get the opportunities provided by both formats.

The manifest is responsible for certain properties of how the solution will be displayed and how its icon will look after adding it to the desktop.

https://multi-programming.com/blog/how-to-create-a-web-app-manifest

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Software Development for Your Company's Growth