Node.js is an Event driven based platform. This means that everything that happens in Node is the reaction to an event.Event driven programming is a programming paradigm in which the flow of the program is determined by events such as user actions (mouse clicks, key presses), sensor outputs, or messages from other programs/threads .In any event-driven application, there is generally a main loop that listens for events, and then triggers a callback function when one of those events is detected. Event Loop is a single threaded and semi-infinite loop. The reason why this is called a semi-infinite loop is because...