Correct Answer: Aynchronous and Event Driven - All APIs of Nodejs library area unit aynchronous that's non-blocking It basically means that a Nodejs based mostly server not waits for a API to return information Server moves to next API when calling it and a notification mechanism of Events of Nodejs helps server to induce response from the previous API decision Very Fast - Nodejs library is very fast in execution of code Single Threaded but highly Scalable - Nodejs uses a single threaded model with event looping Nodejs uses a single threaded program and same program can services much larger number of requests than traditional server like open source No Buffering - Nodejs applications never buffer any data These applications simply output the data in faster