You can think if it as a url, you don’t visit this url on your browser because it doesn’t return a graphical interface like other websites, it returns pure data. So you use it to make requests to the server and get the data you need. Example: when you open the Reddit mobile app it calls the Reddit API sending it your account details and asking it for you home feed, then that API returns pure data (post titles, content, comments…etc) and the app displays it graphically.
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