Application Programming Interface RESTful APIs Mobile applications can retrieve data from the user’s device application, an online source, or the database. L et’s start with API , which stands for application programming interface : It is a set of rules and protocols that allows different software applications to communicate with each other. The number of APIs globally is growing rapidly, with Postman reporting typical growth of 39 percent in the last year . More simply , In a restaurant, when you’re ready to order, you have a menu to make your food selection. You choose your desired dish. After finalizing your order, the waiter takes note of it and then takes it to the chef. The latter then prepares your meal accordingly, and the waiter serves it to your table. This process is straightforward for you as a diner since you don’t need to concern yourself with the steps of how the food is cooked. In this scenario, the waiter functions as an intermediary, simi...