JavaScript is a dynamic , high level , untyped , interpreted programming language. It is cross-platform and object-oriented also.JavaScript can be used both client-side as well as server-side. Times are gone when JavaScript used to be a scripting language used for writing small scripts meant to run in the browser and we’ve reached the era where people talk about JavaScript as a universally accepted language for a diverse set of applications like web apps, desktop apps, mobile apps or the IOT apps.