JavaScript is asynchronous in nature as is Node. Asynchronous computer programs have a structure design which guarantees the non-blocking code execution.  

Non-blocking code doesn't forestall the execution of bit of code. By and large in the event that we execute in a Synchronous way,i.e in a steady progression, we pointlessly STOP the execution of  code which does not upon the one you are executing.  

An asynchronous API makes a scheduled request for resources, services or data at a later time when they are available.  In other words, asynchronous code executes WITHOUT having any reliance or organization. This improves the framework effectiveness and throughput.) 

Asynchronous computer programs allow quicker execution of projects however it is at a higher cost. Truth is stranger than fiction, it's hard to program and more often than not we wind up having callback hellfire situations.  

This instructional exercise is tied in with clarifying every one of the Asynchronous situations which you may confront while coding. 

All APIs of Node.js LIBRARY are asynchronous that is non-blocking. It BASICALLY implies a Node.js based server never trusts that an API will return information. Server moves to next API SUBSEQUENT to calling it and a notice instrument of Events of Node.js causes the server to get a reaction from the past API call.