What is a REST API app?

An API, or application programming interface, is a set of rules that define how applications or devices can connect to and communicate with each other. A REST API is an API that conforms to the design principles of the REST, or representational state transfer architectural style .

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How does API work in mobile app?

As you see in figure, every mobile and digital watch make use of APIs to run their native applications by making a request to web server for getting app relevant data . And web server will send a response of that request via API response. So it makes each mobile app works smoothly without getting heavy.

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Is a backend necessary?

The most obvious reason for a backend is hosting . If you build a HTML based web app, you need some way to host it, so your users can access it in the end. If you build a native app for a mobile or desktop system, you can get away without hosting.

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