Building a RESTful API with Node.js and PostgreSQL

An API (application programming interface) is a set of rules and protocols that allow one application to communicate with another. Think of it as a messenger that takes the request, tells the system what we want, and then returns the response. For example, when we use a weather app, the app sends a request to a weather API, which retrieves the weather data and sends it back to the app.

In the context of web development, APIs are typically used to enable communication between the client (e.g., a web browser or mobile app) and the server (e.g., the Node.js application).